So it is not useful for making decision.
因此决策支持的意义不大。
She is busy studying all day long but it is not useful for her.
她整天都忙于学习但一点效果也没有。
Algebra is not easy for everyone to learn, but it is very useful.
代数对每个人来说都不容易学，但它非常有用。
It is not half as useful as Logic, for it does not prove anything.
它不敷逻辑一半管用，因为它什么都表明不了。
Becoming the useful person is not easy, we should fight for it.
成为有用的人不容易，我们要为之奋斗。
Becoming the useful person is not easy, we should fight for it.
成为有用的人不容易，我们要为之奋斗。
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