This problem happened before and we know how to solve.
之前发生过此问题，我们也知道如何解决。
In the condition of mechanical problem happened during the flight such as flaps loose efficiency.
在某些情况下，飞机上的部分机械系统会失效，比如襟翼。
The problem is akin to what happened in early set theory.
这个问题类似早期集合论发生的情况。
It's up to you to find out what happened and remedy the problem.
那么，你该找找到底出了什么问题及补救办法。
Without what happened, but I know what the problem is always there.
没有发生什么事，但我知道问题是一直存在。
The same problem just happened to me.
同样的问题，只是发生在我身上。
The only problem is that nothing happened the prior night in Sweden.
唯一的问题就是瑞典前一晚什么事都没发生。
What happened? I heard there was a problem.
怎么啦？我听说出问题了。
Record how you feel about what happened, and your views on a problem.
记录下对发生事情的感受，对问题的观点。
In this period, great movement happened, crime became a serious social problem.
此一时期，英国的社会发生了剧烈的变化，它的犯罪问题才真正凸显出来。
I did not have problem with the short message before, just happened today.
我以前用短讯都没问题，就今天列外。
Monitoring the production process and solve the problem may happened in time.
监督工厂生产过程以及及时解决所遇到的问题。
Monitoring the production process and solve the problem may happened in time.
监督工厂生产过程以及及时解决所遇到的问题。
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