The opening ceremony of the 19th Asian Games    1     (take) place at the Hangzhou Olympic Sports Center Stadium in Hangzhou, East China’s Zhejiang province    2     Saturday evening.

The ceremony    3     (theme) “Memories of Jiangnan” used the element of water    4     (showcase) the region’s natural beauty and cultural charm,     5     was a feast for the senses with stunning visuals.

During the parade, images of West Lake were projected (投射) onto the floor screen,     6     (allow) athletes and spectators to enjoy the city’s picturesque scenery in an immersive way. The     7     (enter) of the Chinese team was accompanied by a breathtaking visual representation of the motherland’s mountains and rivers. Also, netizens     8     (fascinate) by the display of oriental东方的aesthetics美学, strength of technology and warmth of art.

The opening ceremony    9     (definite) boasted many historic firsts. Not only did it break new ground in terms of technology using digital ignition (点火) for the first time, but also drew inspiration from    10     (tradition) culture, combining Hangzhou charm and Chinese elements.

2 . Sportsmen in the running races of the Olympics are great athletes, but even the slow runners of the running world — joggers in the park — have good health. A study out this week in the Journal of the American College of Cardiology finds that even 5 to 10 minutes a day of slow running is enough to extend life by several years, compared with not running at all.

The new study focused on a group of more than 55, 000 men and women aged 18 to 100. About a quarter of them were runners. Over 15 years, those who ran just 50 minutes a week or fewer at a slow speed were less likely to die from either cardiovascular (心血管的) disease or other causes, compared with those who didn’t run at all.

The study suggests relatively low efforts are necessary to benefit from jogging, but it can be better to exercise more often. “A little bit is good but a little more is probably better,” says Dr. Aaron Baggish. A 2013 study in Denmark suggested that the secret of maximum longevity is up to 2. 5 hours of running a week.

Although running can make you less likely to have cardiovascular disease, it doesn’t entirely take the risk away from you. “There is no question that the healthier you are and the more exercise you do, the longer you’ll live and the better your quality of life will be,” Dr. Baggish says. “But it doesn’t mean you’ll never get sick.”

“Many long-term runners do not run because they want to live longer,” Dr. Baggish notes. “They run because it makes them feel better every day.”

For these runners, the cost of feeling good can be injuries, so Dr. Baggish supports the value of what he calls “active rest.” His belief, not supported by any recent research, is that it’s a good idea to spend 25% of exercise time over the course of a year running at a slow speed or doing other activities like swimming or biking.

6 . The highlights of every World Cup are the impossible goals, especially the arc (弧线) ball goals. It’s breathtaking to watch. Every spin (旋转) of the ball moves air across the surface, pushing it into a bend.

When a soccer ball flies, the air forms a layer around the surface of the ball. As the balls pins, it changes the direction of the air to one side, says John Bush, an applied mathematician at MIT. This air pushes the ball in the opposite direction. The player starts with a strike on the outside of his right foot, which hits the left side of the ball, starting a clockwise spin. It throws the air off to the left, and the force created by the air leaving the ball pushes it to the right, explains Bush. Thus, a ball spinning to the right (that’s clockwise) will also are towards the right. This force is called the Magnus Effect.

It helps the goalkeepers, because they see uniform curvature (曲度) when players are taking bending shots at them. If they can pick up the spin right, it’s going to be the same amount of curvature, and they know where to put their hands. This is partly why players are much more likely to take bending shots during free kicks when goalkeepers can’t see their kicks quite as well because of the wall of defenders. If a ball isn’t spinning, it does something called knuckling, where the air turns the ball to one side in random directions, causing it to bounce in-the air unpredictably. “It’s usually achieved when a player manages a sharp, fast touch of the ball, typically right on the air valve where the ball is most firm.” say a Bush. Its lack of spin kept the goalkeeper from being able to predict where it was going until it was too late. All the goalkeepers tremble before the kicker that can shoot this kind of soccer ball.