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。
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。
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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