A builder once told me that when you buy a house, it's important to check the foundations: you can fix most problems, but if the foundation is unstable, you may end up having to start from scratch.

一位建筑工人曾经告诉我，你买房子的时候，检查一下房子的地基是非常重要的。因为你可以解决大部分问题，但是如果地基不稳的话，最终你就只能推倒重建了。

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This means that, once diagnosed as having it, a patient is well advised to present himself for a check-up every three months for the rest of his life.

这就意味着，一旦病人被诊断患有这种癌症，在余下的生命中，他就不得不接受每三个月一次的检查。

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You can use that behavior to tell that the user is not online by having a scheduled agent check the timestamp and reset the user's status when it turns old.

您可以利用此行为来判断用户没有在线，通过使用预定的代理来检查时间戳，并在出现更新的时间戳时重置用户状态。

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"It's like having a spell check that underlines words if you've made a mistake, " says Rutgers Professor Bill Ward, who was shocked that Chalfie's bacteria shone at all.

FORBES: Magazine Article

Those who cannot get online will be offered "alternative ways" of having a health check.

BBC: Mouse and laptop

You may be tempted to layer up the clothing to avoid having to check a suitcase, but you'll pay for that frugality at the checkpoint if TSA makes you peel off extra sweaters, shirts, pants and jackets.

WSJ: Tips to Take the Hassle Out of Travel