名词
中文翻译：Unknown
同义词：
['chemical', 'chemically', 'chemistry']
例句：
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1. The chemical reaction between the two substances is very complex.
两种物质之间的化学反应非常复杂。
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2. The chemical composition of this compound is known to be stable.
这种化合物的化学组成已知是稳定的。
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3. Chemical engineers are responsible for designing and testing new products.
化学工程师负责设计和测试新产品。