One may render a database completely useless should he back it up at the filesystem level.
如果在文件系统级进行备份，就可能使数据库完全失效。
The second lesson is that some valuations are completely useless for picking Asian stocks.
第二个经验是，在亚洲，某些估值指标对选股完全无益。
The bearing for motor was not so bent as to be completely useless. We only required it to be re-aligned.
电动机轴承弯曲，但没有严重到不能使用，我们只要求重新对直。
Which subjects at school do you think will be completely useless to you in the future? Which ones do you think will be important to you?
你认为学校里哪门课对你来说在将来是完全用不上的呢？那么哪门课对你又是重要的呢？
Which subjects at school do you think will be completely useless to you in the future? Which ones do you think will be important to you?
你认为学校里哪门课对你来说在将来是完全用不上的呢？那么哪门课对你又是重要的呢？
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