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来源:雅诚德英语网
As time goes on, different types of microorganisms appear, and the plaque thickens.
随着时间延长,不同类型的微生物出现菌斑也开始增厚。
As time goes on, different types of microorganisms appear, and the plaque thickens.
随着时间延长,不同类型的微生物出现菌斑也开始增厚。