Even if service is substandard still leave at least some tip.
即使服务是不合格的，也要记得给一些小费。
She has written good essay before, but this one is substandard.
她以前写的文章不错，但这一篇却不怎么样。
A drug with content not up to the national drug standards is a substandard drug.
药品成份的含量不符合国家药品标准的，为劣药。
A drug with content not up to the national drug standards is a substandard drug.
药品成份的含量不符合国家药品标准的，为劣药。
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