只要你需要导引对你就有用。
但是单纯的道歉真的就有用么？
But does simply owning up and saying sorry actually do any good?
很明显在饼干人爱情故事里面，就有用到循环。
Certainly in the cookie love story was there a looping going on.
这是您的钱，请保留兑换单，以后就有用的。
第一单元学得叉积、法向量这些,现在就有用了。
The first unit about cross-products,normal vectors and so on is actually useful now.
如果你花了太多你积攒的钱，你就有用完钱的风险。
If you spend more by dipping further into savings, you risk running out of money.
全球每四个城市中就有一个有用水压力。
为了实现有用的知识，分析论和理解力必须就有目的。
To achieve useful knowledge, the analysis and understanding must have purpose.
为了实现有用的知识，分析论和理解力必须就有目的。
To achieve useful knowledge, the analysis and understanding must have purpose.
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