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1. The chemical reaction between hydrogen and oxygen is what makes fire.
氢和氧之间的化学反应产生了火焰。
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2. Chemical sensors are used to detect changes in the environment.
化学传感器用于检测环境的变化。
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3. The scientist discovered a new way to control the chemical reactions in the lab.
科学家发现了一种新的方法来控制实验室中的化学反应。