There comes a time when the response you seek is no longer useful.
总会有一个时间期限，过了这个期限之后，你想要的答复将不再有用了。
It is easy forget that useful code can take some time to perform its function.
有用的代码要花些时间来执行其功能，这一点容易被遗忘。
The goal is ultimately to make this data useful to actual people, in real time.
这一目标的宗旨是使得现实生活中的人们可以实时地使用这些数据。
The CLOSE_LOG call is useful to determine the elapsed execution time.
CLOSE_LOG调用对于确定使用的执行时间非常有用。
This is useful as contexts may change over time.
在上下文可能随着时间而改变的情况下，这非常有用。
Loneliness is very useful to a writer, you must have time to think for themselves.
孤独对一个作家是很有用的东西，你必须要有时间来独立思考。——北村。
Working is a useful experience for them and they make money at the same time.
工作是一种有益的经历，他们赚了钱，在同一时间内。
This is useful when you and your server are in different time zones.
当你和你的服务器在不同的时区的时候，这很有用。
This way we won't waste our time learning something which is not useful.
这样，我们就不会浪费时间去学习那些没用的东西。
They should spend their time learning what is useful.
他们应该花时间学习有用的东西。
Hou marketing at that time is not useful, and is the key.
侯营销在那个时候是没有用的，而且是关键。
Yes, man is more useful than woman in past time.
是的，在过去，男人比女人有用的多。
Method of intelligent sampling control is very useful for controlling the time delay system.
智能采样控制方式能够很好的实现带有大延迟环节的系统控制。
What country is useful at meal time?
什么国家在吃饭的时候最有用？
This is useful for events that last all day and have no fixed time.
这对于持续一整天，没有固定的时间的事件非常有用。
It is a useful experience for them and they make money at the same time.
对于他们来说兼职是一段有用的经历，同时他们还赚了钱。
It is a useful experience for them and they make money at the same time.
对于他们来说兼职是一段有用的经历，同时他们还赚了钱。
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