名词
中文翻译：替代物
同义词：
['substitute', 'substitute', 'proxy']
例句：
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1.The new drug is a substituting for the old one.
新药是旧药的替代品。
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2.The substitute teacher was able to cover the class's needs.
代课老师能够满足班级的需求。
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3. The substitute teacher was able to cover the class's needs.
代课老师能够满足班级的需求。