【推荐1】If you’re new to San Francisco, paying the city a visit, or simply looking for a new playground for you and your dog, here are four of the finest dog parks in San Francisco.

Corona Heights Dog Park

Often visited by residents from all over the city because of its nearness to the Randall Museum, Corona Heights Dog Park offers pets and owners breathtaking view after a steep hillside climb, and a fenced dog area that allows dogs to let loose without a leash（狗链）. Owners will also enjoy the playground, tennis courts and basketball courts.

Dolores Dog Park

The grounds of Dolores Park once served as camps for those who were left homeless by the 1906 earthquake, but now are often visited by crowds of Mission District people. Four-legged friends can also wander about carefree off-leash while making friends with other members of the doggie community.

Pine Lake Dog Park

Famous for its place as a rest stop for hundreds of species of birds to fly to and from warmer climates, Pine Lake Park is also prized by city dogs and their owners for their nice hiking paths, picturesque lake suited for swimming, and off-leash area on the park’s west end that lets dogs run free.

Buena Vista Dog Park

With a history of 146 years, Buena Vista Park is San Francisco’s oldest park. Dogs and owners with plus energy will love burning it on this park’s steep paths and winding staircases. Dog owners should have good control over their dogs, as it’s quite easy for dogs to get separated when going through Buena Vista’s many twists and turns.

【推荐2】On a remote island in Norway, around 1,000 kilometers from the North Pole, sits the Svalbard Global Seed Vault (保险库).    1    But deep inside, there are hundreds of thousands of seed samples (样本). According to the most recent count, this vault holds 890,000 samples of seeds from all around the world!

    2    There are over 1,000 seed banks like that around the world. They were created to store crop seeds in case they disappear from nature. And the one in Svalbard, Norway, is just one of them. It is there in case any of these seed banks get destroyed.

Inside the Svalbard Global Seed Vault, the seeds sit sealed in boxes. The temperature stays at -18°C. Scientists monitor the moisture levels and temperature inside the bank.     3    

But in February 2018, the Norwegian government announced that the Svalbard Global Seed Vault would be getting some updates.    4    Why?

In general, these updates will make the vault more secure. In 2017, outdoor temperatures in the region were warmer than usual. The warm temperatures melted the permafrost (永久冻土层) in the region.    5     It didn’t affect any of the seeds, but it got scientists to think about future risks. For example, rising temperatures due to climate change could make more permafrost melt.

【推荐1】We all enjoy the colors of autumn leaves.     1     To answer this question, we first have to understand what leaves are and what they do.

Leaves are nature’s food factories. Plants take water from the earth through their roots and take carbon dioxide from the air.     2     Plants use the sugar as food for energy. The way plants turn water and carbon dioxide into sugar is called photosynthesis(光合作用). Chlorophyll(叶绿素) helps make photosynthesis happen. Chlorophyll gives plants their green color.

As summer ends and autumn comes, the days get shorter and shorter.     3    .

During winter, there is not enough light or water for photosynthesis. Trees will rest and shut down their food-making factories. There is no chlorophyll in the leaves. As the bright green fades away, we begin to see yellow and orange colors.     4     We just can’t see them in summer because they are covered by the green chlorophyll.

The bright reds we see in leaves are made mostly in autumn. In some trees, like maples(枫叶), sugar is kept in the leaves after photosynthesis stops.     5     The brown color of trees like oaks is made from the wastes which are left in the leaves.

All these things make the beautiful colors we enjoy in autumn.

【推荐2】How Laughing at Yourself Makes You Attractive

Have you ever embarrassed yourself in public and got laughed at for it ?    1    And it’s okay—we should even have a laugh about them.

● Laughing at yourself means accepting who you really are. You may feel bad about yourself because of past misfortune. However, it’s normal to be imperfect. What’s important is that you should be honest with yourself about who you are.    2     You won’t be able to laugh at yourself without self-acceptance.

● Laughing at yourself helps increase your confidence. When you’re able to stay optimistic and laugh at yourself, you are likely to be more successful in life.    3    .More importantly, it helps you realize your own weaknesses, so you know which areas to do better in.

●    4    .Laughing at someone else may hurt their feelings even if you didn’t intend to, while laughing at yourself does not.—You might even bring a smile to their faces. People will like it, because it shows that you have the courage to do so and you’re being real about your imperfections.

    5    .So instead of blaming yourself, try to think of your mistakes, in a positive way and accept yourself just as you are. Learn to laugh at yourself and you will be more attractive.

【推荐3】A heat wave roasted millions of people across the Pacific Northwest, claiming hundreds of lives. Climate change has made heat waves like this one more frequent and intense than those from any other point in recorded history. A study published in the journal Nature Climate Change found global warming responsible for 37 % of heat-related deaths between 1991 and 2018.

The following is what happens if you’re one of the next people whom extreme heat kills, according to W. Lawrence Kenney, an expert from Penn State University. First, your brain sends messages to encourage sweat production. Then your heart starts beating faster to pump blood to the skin while blood flow is also directed away from your liver, kidneys, and gut. That’s your body attempting to make your skin hotter than the air outside, in hopes of creating a convection (对流) phenomenon that moves heat away from you.

If heat stroke (中暑) occurs, your body might get so hot and redirect so much oxygen-rich blood to the skin that it fails those vital internal organs. Surviving the organ failure that follows might require an emergency transplant. If your body fails to cool you down, its internal temperature might start to climb from a normal level of about 98 degrees Fahrenheit to somewhere closer to 104 degrees. At that temperature, the brain becomes affected and you may feel it start as a headache. Before long, you might not know where you are or what time it is. Left untreated, what follows is a series of organ failure that leads to all but certain death. And that’s just part of what we know about how extreme heat kills you.

“It’s important for people to understand that there’s still a lot we don’t know about heat stroke and who’s most likely to be harmed,” Kenney said. “That’s because we can’t study it in humans in the laboratory. A lot of what we know comes from studies on animal models, like mice and rats, or from postmortem examinations (尸检) of people who have died of heat stroke.”

【推荐1】The UK’ S Best Theme Parks

The new Tamarin Trail takes adventurers through beautiful gardens, allowing kids and adults to come face-to-face with a troop of monkeys. The park is also home to Europe’ s only Thomas Land, which last year underwent a £2.5m expansion, including new rides. There are thrilling rides, including the stand-up roller coaster, Shockwave, and the 54-metre drop tower, Apocalypse.

Adults from £l5, children from £10(under-2s free)

All aboard Derren Brown’ s Ghost Train which opened in July 2016. This 10-15 minute train journey includes exciting live-action performances, 4D special effects and so on. Also new is “I’ m a Celebrity. Maze (迷宫)” , and there are some of the highest and fastest rides in Europe here too.

Adults from £28, children from £24(under-3s free)

Although not officially a theme park, this medieval castle offers history, magic, myth and adventure to suit all ages, and is now home to the UK’s first fully interactive and multi-sensory Horrible Histories Maze, giving vistors a fascinating experience of getting lost in time. From July, you can sleep over in the new riverside Middle Ages-themed woodland cottages of Knight’s Village.

From £31(under-3s free)

Following the Pandamonium live show in 2016, last year saw The Gruffalo River Ride Adventure open at Chessington, which has over 40 rides and attractions. Rides include Dragon Falls, Safari Skyway, Toadies Crazy Cars and Runaway Train.

From £29(under-3s free)