Hearing something once is not enough to really learn it. That's why it is so important to take notes.

有些东西只听一遍并不足以听懂，这就是做笔记显得重要的原因。

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And once, it seems, is often not enough.

但人们似乎一度视为这还不够。

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As this is a task that must be done regularly, it's not enough for you to simply type Anacron once.

由于这是一项必须定期执行的作业，仅仅输入一次Anacron是远远不够的。

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It's gauging whether or not a leaner RIM is once again nimble enough to stay relevant.

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As Ghilarducci points out, Social Security is simply not enough for many folks once they stop working.

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Once enough money is taken away from the schools, they will not be able to compete.

ECONOMIST: Letters | The