It is difficult to grasp the concept of infinite space.
掌握无限空间的概念是很难的。
Laughter is not difficult, it is difficult to grasp the scale laughing.
笑不难，难的是把握笑的标尺。
The article is really a difficult concept to grasp when you have no base knowledge of it.
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.
当你没有冠词的基础知识时，冠词确实很难掌握。
应用推荐