It may be useful but costs too much.
它可能有用,但成本太高。
These methods may be useful for a while, but it is difficult to solve this problem completely.
这些方法可能暂时有用,但要完全解决这个问题是很困难的。
I think it's very useful. It may not be immediately apparent to people in Darfur, but in the end it is a contribution towards a solution to their problem."
VOA: standard.2009.10.23
On the other hand, you don't have to withhold information that may be useful to the class.
另一方面,你又不能刻意保留对这门课有用的信息
Some may or may not be useful, but you just don't know.
有些可能有用,有些可能没用,但你们现在还不知道
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