我们通常需要很长时间才能真正掌握一项技能。

It usually takes us quite a long time to truly master a skill.

youdao

史密斯吃惊的是，她并没有真正掌握作者所描述的任何技能。

Smith was struck mainly by the fact that she didn't truly grasp any of the skills the author described.

youdao

要真正掌握一种语言需要花很长时间。

It would take ages to really master a language.

youdao

Homework is when you really figure out how much you know and don't know.

作业能让你真正弄清楚,自己对知识的掌握程度

耶鲁公开课 - 基础物理课程节选