以下为句子列表：
英文: Hydrogen： Lightest chemical element, chemical symbol H, atomic number 1.
中文: 氢:一种轻的化学元素，化学符号H，原子序数1。
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英文: Hydrolysis：Chemical reaction in which water (H2O or HOH) and another reactant exchange functional groups to form two products, one containing the H and the other the OH.
中文: 水解:一种化学反应，其中水与另一个反应物交换官能团而形成两个产物，一个含H，另一个含OH。
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英文: I can't be faithful to my wife because I have a chemical imbalance.
中文: 我对妻子不忠，是因爲我体内的化学作用失调了。
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英文: Install chemical tanks as required, and ensure each dose pump discharge tubing is connected to the manifold injection points provided.
中文: 按要求安装化学箱槽时，确保每根加药泵的排放管线与相对应的注入点相连接。
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英文: Many chemical and industrial enterprises are built along rivers so that they can dump the waste into water easily,Chen said. Excessive use of fertilizers and pesticides also pollute underground water.
中文: 中国医学科学院肿瘤研究所的健康专家陈智周说，“恶性肿瘤高发的主要原因是环境污染，空气和水污染正日益严重。”
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