He needs a pair of good boots.

他需要一双好靴子。

youdao

Do you need a pair of good boots?

你需要一双好靴子吗？

youdao

Now I need a pair of good tennis shoes.

现在我需要一双不错的网球鞋。

youdao

If you give me a pair of numbers, Ax and Ay, that's as good as giving me this arrow, because I can find the length of the arrow by Pythagoras' theorem.

如果给我一组数字,Ax 和 Ay,就相当于给了我这个箭头示意图,因为我可以利用毕达哥拉斯定理定理求出模长

耶鲁公开课 - 基础物理课程节选

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