名词
中文翻译：替代杂质
同义词：
['substitute impurity', 'substitution impurity']
例句：
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1. The new drughas a substitution impurity that is not present in the old version.
新药具有一种在旧版本中不存在的替代杂质。
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2. The quality of the substitute was significantly better than the original material.
这种替代品的质量明显优于原始材料。
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3. The substitution impurity in this product may cause allergic reactions in some individuals.
该产品中的替代杂质可能引起某些人的过敏反应。