And this was more evidence that they just don't understand objects, and that this thing takes a lot of time and learning to develop.

这更证明了 他们并不理解客体的概念,而这种概念需要通过大量的时间学习,才能够掌握

耶鲁公开课 - 心理学导论课程节选

The challenges that... First of all, you got to understand that learning a language takes time.

挑战就是，首先，你必须明白学习一门语言是件耗时间的事。

学第二外语的时候 - SpeakingMax英语口语达人