difficult subject是什么意思 difficult subject怎么读
difficult subject的英文翻译是什么意思，词典释义与在线翻译
difficult subject的用法和样例
- Her work has contributed enormously to our understanding of this difficult subject.
她的著作极有助于我们对这个困难问题的了解。 - I feel that geometry is a difficult subject.
我认为几何是一门难学的课程。
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