But it is still a hard trick to pull off, and it has not happened often.

尽管如此，这还是一种很难完成的事情，并且并不常见。

youdao

She didn't like the fact that it happened, and would often pick up the bottles from the floor and drop them in the bin.

她不喜欢已经发生的这种事实，她经常把它们从地板上捡起来然后放到垃圾箱里。

youdao

My, how quickly it happened. Often it seemed as if the anger came out of nowhere.

愤怒经常看起来好像无处不在，它发生得太快了。

youdao

Often,we just don't know how it got it, and it just happened because somebody just said, "It's authoritative. It must've been written by an apostle."

我们通常都不知道它是如何来的，它已经成了事实，因为有人说，“它具有权威，肯定是由一位使徒所写“

耶鲁公开课 - 新约课程节选

It's often fanciful; it relates imaginatively events which it claims Happened in historical time, not in a primordial realm before time, And a myth is designed to explain some kind of practice or ritual or custom or natural phenomenon.

它常常天马行空，关乎一些想象中的事件,它们发生在有历史记载的时期，不是在史前原始王国，所以杜撰故事一般都是来解释一些惯例,或者仪式和风俗或者自然现象。

耶鲁公开课 - 旧约导论课程节选

So, this is an absolutely outstanding discovery, even though, if we think about it, what is the probability that this happened, how often did this happen?

0个alpha粒子，这绝对是一个，很了不起的发现，虽然我们仔细想想？

麻省理工公开课 - 化学原理课程节选

"It is not often understood that what happened in Asia in the past year is a reflection of what has happened to the yen, " says Richard Koo of Nomura Research Institute in Tokyo.

CNN: FROM BAD TO WORSE

"It's something that hasn't happened often over the years but I'm delighted, " said Ameobi.

BBC: Ameobi enjoys Magpies renaissance

It's often done in just one frame, and the audience is hardly aware it's happened says chief character animator Rex Grignon.

NPR: Making an Animated Escape to 'Madagascar'