7 . In order to survive trips to Mars, humans need oxygen. Now, a team of scientists has designed a robot that could extract oxygen from water on the Red Planet.

The robot, which is called “AI chemist”, used a machine learning model to find a compound that could ignite an oxygen-producing chemical reaction on Mars. The compound, known as a catalyst (催化剂), is made entirely from elements found in Martian meteorites (陨石)   — which means, if such a system could work reliably, space travelers would not need to bring oxygen or even the catalyst needed to produce it.

Mars’ atmosphere contains only trace amounts of oxygen. But scientists have detected evidence of liquid water beneath the planet’s southern ice cap. To create the breathable gas, researchers wanted to find a way to break down this water into its hydrogen and oxygen molecules using materials found on Mars.

Their robot analyzed five meteorites that either came from Mars or had a composition similar to that of the Martian surface. Using a laser, it identified significant amounts of iron, nickel, calcium, magnesium, aluminum and manganese in the samples. From these six elements, the robot’s algorithm (算法) determined it could produce more than 3.7 million possible molecules to break down water and form oxygen on Mars. According to the researchers, finding the best one from this extensive list would take roughly 2,000 years of human labor, but for the AI chemist, it took only weeks.

“On Earth, we don’t use these six elements,” Yi Luo, a co-author of the study says. “They are not the best choices for catalysts, but it’s only what you’ve got on Mars.”

With its chosen catalyst, the system could produce oxygen from the Martian materials at around -37℃, demonstrating the chemical reaction could be possible on the cold Martian surface.

Notably, the robot was able to carry out the entire process — analyzing the rock samples, identifying the best possible catalyst and producing it without human intervention.

8 . Bryan was driving home one evening. It was starting to get dark and cold. Ever since the factory closed, he’d been unemployed. Suddenly, he saw an old lady ________ standing beside a car on the side of the road. So he ________ in front of her and said, “I’m here to help you ma’am. Why don’t you wait in the car where it’s ________? By the way, my name is Bryan.”

All she had was a ________ tire, but for an old lady, that was bad enough. Bryan crawled under the car and soon he changed it. The lady asked him how much she ________ him. Bryan never thought twice about the ________ and told her that if she really wanted to pay him back, the next time she saw someone who needed help, she could give the ________, and Bryan added “... and think of me”. She started her car and drove off.

A few miles down the road, the lady saw a small cafe and went in. She ________ that the waitress was nearly eight months pregnant, but never let the strain and aches change her attitude. Then she remembered Bryan. As the waitress went to get the ________ for her hundred-dollar bill, the lady slipped right out the door. ________, the waitress noticed something written on the napkin under which were four more $100 bills. There were ________ in her eyes when she read what the lady wrote. It ________ : “Somebody once helped me out the way I’m helping you. If you really want to pay me back, do not let this chain of love ________ with you.”

That night when she got home from work, she was thinking about the lady. With the baby due next month, it was going to be hard. She knew how ________ her husband was, and as he lay sleeping next to her, she gave him a soft kiss and ________, “Everything’s gonna be all right; I love you, Bryan.”

10 . When you’re planning scheduled activities, knowing what to expect can help you feel mentally prepared for what’s to come. But sometimes, despite how much time and effort you put into planning something, things go wrong and everything falls apart.     1     Following are some strategies that can help you cope when things don’t go as planned.

Start by finding alternatives.     2     For instance, if you’re waiting on someone who’s running late, think about what you can productively do in the meantime so you’re not sitting idly by until they arrive. Is there work or a call you might be able to catch up on while you’re waiting?

Besides, you can benefit from working on flexibility. If something changes in your schedule, take a moment to assess how it affects you and whether you can realistically manage the change in plans. Rather than reacting immediately or assuming the worst, calmly and logically work out whether or not you can accommodate the change. You might find that you are in fact able to cope with it.     3    

    4     People often try very hard to do things perfectly. However, chasing perfection can be a losing battle. It’s often more helpful to have realistic expectations and to be willing to adjust them depending on the circumstances.

What’s more, don’t forget to seek support. If you feel you’re struggling with something difficult, it can be helpful to seek the support of your colleagues, friends, or family members.     5     They can also help you find solutions, or simply provide moral support while you’re facing something difficult.