我爸爸生病了，他正卧床不起呢。

My father is ill and he is lying in bed.

youdao

你为什么不起来跟我们一起玩呢？

Why don't you get up and play with us?

youdao

而且，老师在忙着这些的时候，学生们的手臂会不会最后累得举不起白板来呢？

And while the teacher does this, do the pupils' arms tire of holding up the boards?

youdao

I'm simply saying swap X with Y, but this 2 won't work, because where are X and Y defined?

我只简单地说交换X和Y，但是这两行不起作用，因为X和Y是在哪里定义的呢？

哈佛公开课 - 计算机科学课程节选