So what's behind this onslaught of mucus?

这种突如其来大量黏液原因是什么呢？

Then in March the news abruptly turned sour.

此后三月份突如其来，让人不爽。

But that came out of the blue.

但突如其来疫情让我们防不胜防。

He looks confused about what is happening.

他对这突如其来横祸感到迷茫。

Erie has a reputation for treacherous flash storms.

伊利湖以其突如其来闪电式风暴而名。

My body was discovered by my neighbor Mrs. Martha Huber, who'd been startled by a strange popping sound.

我尸体是被我邻居Martha Huber发现，她被这突如其来声音吓了一跳。

And all of a sudden, that friend group happens and you start to settle in.

突如其来地朋友圈形成了，你也开始适应。

If you ever get caught driving in a fast descending snowstorm, here's a tip.

如果开车途中恰逢突如其来暴风雪，下面这个驾驶小技巧了解一下。

Maybe it is sudden changes, or social situations.

也许是突如其来变化，或者是社交。

So, what is the strategy he uses to deal with these Parkinson's symptoms?

面对突如其来帕金森症状，他是如何应对呢？

It is sometimes said that the British don't know how to respond to compliments.

据说有时候英国人根本不知道如何应对突如其来赞美。

Well, I told you that my colleagues would be shocked by me paying them compliments.

唔，我说过，我同事会被我突如其来赞美给吓到。

His answer to this sudden attack was delightful to their mother's ear.

彬格莱先对她这一番突如其来挑衅回答得叫她母亲很是高兴。

The cause of the sudden tension is not clear.

这次剑拔弩张突如其来，原因尚不明确。

A land of heat and swamp and sudden floods.

这个平原上土地又热又湿，有时洪水突如其来。

'Don't go on! 'cried Tess. 'I can't believe in such a sudden change!

“别再说下去了! ” 苔丝叫了起来, “我不能相信这样一个突如其来改变!

Cut it down? What... is this destructive all the sudden?

把它剪下来（cut it down）？这突如其来破坏是什么？

But he was surprised that Holmes had no luggage and that he appeared so unexpectedly.

可是，他为福尔摩斯既没带行李又是突如其来而感到很惊讶。

Animal experts say the sudden darkness triggered a natural reaction among many of the animals.

动物专家表示，突如其来黑暗引发了许多动物自然反应。

Looking back on the extended mission, Williams told CNN it's all part of the job.

回顾突如其来加班，威廉姆斯向CNN表示这是她们工作一部分。