你须谨记任何技术技能的掌握都是需要时间的。

Remember that mastery of any art or skill takes time.

youdao

但是，和你浪费在你本来已经掌握却还要在课堂学习的时间相比，你会庆幸自己为已经掌握的东西申请学分后还可以得到一点额外的空闲时间。

But, when you compare it to the time you would have spent in class learning material that you've already mastered, you'll be glad you took a few extra hours to get credit for what you already know.

youdao

要想真真正正的学会唱歌，那要花费你很多时间，甚至你要用一生来掌握它。

Learning how to sing - to really learn how to sing - can take a long time, even a lifetime to master.

youdao

So you should spend time mastering this pattern.

因此，你应该花一点时间掌握这个句型。

Is there 课堂 - SpeakingMax英语口语达人