Making life's ingredients
本文作者： 21ST
CHEMISTS find ways to make chemicals useful to us. They also try to improve things that people use every day, such as paint, medicine, and cosmetics (化妆品), as well as cars and airplanes. Model: Chen Yitao, From Guangdong Guangya Middle School. Chemists also search for new chemicals in nature. They search for ways to save energy and reduce pollution. ... |  |
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