The biology of bacteria can be quite hard to understand.
细菌生物学有时会很难理解。
The biology of bacteria can be quite hard to understand.
细菌生物学有时会很难理解。
The judge said that it was difficult to comprehend why the police acted so in this matter.
法官说很难理解为什么警察在件事
样做。
声:以上例
、词
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