题目内容：
Tom is a biologist（生物学家）. when he started working in a chemical factory, he thought he was protecting his children. he wanted to offer the best things in their life, such as a big house, a boat and wonderful vocation. I think he must love his family very much, and did a lot for it. even in the most difficult time, he never give up his family and children. this kind of person is no doubt admired by others. he loved chemistry(化学) and lost a lot of things because of it. but he never gives up, and always work hard . It gives me a deep impressing that when he knew the four little leopard （豹）were dead of environment pollution, he believed that chemistry can bring benefit to the humans
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