Each unit should have only limited knowledge about other units: only units "closely" related to the current unit.
每个单元对其他单元只拥有有限的知识,只了解与当前单元紧密联系的单元;
Looking at a number of sources gives you a good knowledge base, but students only have a limited amount of time to work on each paper.
阅读大量的文献可以打下坚实的知识基础,但是学生们完成每篇论文的时间非常有限。
I have only a limited knowledge of the language.
我对这门语言只有有限的了解。
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