当你没有冠词的基础知识时，冠词确实很难掌握。
The article is really a difficult concept to grasp when you have no base knowledge of it.
当你没有基础知识时，冠词确实很难掌握。
They are really a difficult concept to grasp when you have no base knowledge of it.
学习认真，掌握扎实的专业基础知识。
Learning seriously, have a solid basic knowledge of professional.
掌握一定的经济，管理，法律等基础知识。
由此可见，我们对于基础知识掌握是十分至关重要的。
由此可见，我们对于基础知识掌握是十分至关重要的。
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