But it is not clear how often this happens.

但是，目前尚不清楚它的发生频率。

youdao

Grandchildren and the children of friends can visit and stay, but there are even limits on how often this happens.

孙子孙女或者亲友的孩子允许来访小住，但多久来一次是有限制的。

youdao

This often happens in different forms of art.

这通常发生在各种艺术形式当中。

youdao

This happens when an official language is used more often and children stop learning the local language of their parents.

VOA: special.2009.12.02

We'll talk more about this later, but it often happens that when you change your program to solve one problem you break it, and things that used to work don't work.

我们以后会更多的去讨论者一点，但是经常发生的情况是当你因为,一个问题修改你的程序的时候,你修改了程序,但原来没问题的模块。

麻省理工公开课 - 计算机科学及编程导论课程节选

We have a couple of passages, one in the book of Numbers, one in the book of Job, which describe this condition in a way that identifies it with death. An aborted fetus is often not often, it happens once in the book of Job.

有两篇文章，一篇在《民数记》,一篇在《约伯记》里，描述了这种,意味着死亡的状况，比如说，一个被流产掉的胎儿就,但这些例子不多，只在《约伯记》里出现了一次。

耶鲁公开课 - 旧约导论课程节选

You'd be surprised at how often this happens -- I get this a lot.

CNN: How do I retrieve a lost file?

You'd be surprised at how often this happens -- quite frequently.

CNN: How do I retrieve a lost file?

You will be surprised at how often this happens.

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