What causes our nose to randomly bleed?

什么导致你的鼻子不分来由地就流血了呢？

They're what's responsible for the smell of freshly cut grass.

也就完草时那股味的来由。

That's where the railway comes in.

这就这条铁路的来由。

It is tradition that dates back hundreds of years.

这民俗的来由可以追溯到几百年前。

She tried to tell me about it but I knew it was something funny.'

她想法子向我说明它的来由，但我知这件事蹊跷。”

A great chasm eroded over 250 million years by the Colorado river.

这条巨大的峡谷，在2亿5千万年来由科罗拉多河侵蚀而成。

That's where the puffling patrols come in.

这就海雀巡逻队的由来。

The way to overcome a mental affliction is to cease to look at it merely as an explanation-less nuisance.

克服精神痛苦的方法不再把它仅仅种没有来由的麻烦。

And you're thinking, " Mm, are you gonna finish this or shall I finish this? "

你在想，“嗯，由你来结束聊天还由我来？”

So that's where the challenge comes in.

这就挑战的由来。

Now let us look at the two-word form of " every day."

现在让我们来看看由两个单词构成的every day。

So this is the source of the word, Pygmalion.

这这个词的由来。

And that is where our expression comes in.

这就我们表达的由来。

And that's how it came to be.

这就它名称的由来。

Which is exactly where the doors come in.

这正飞机舱门的由来。

That's how the Educove platform came to be.

这就Educove平台的由来。

That's where the Soviet Union comes from.

苏维埃就苏联的由来。

And that was the reason for leafing day.

这就叶子节的由来。

In time, it will become known as Thanksgiving.

那就感恩节的由来。

Now let's look at early initiation of CPR by lay rescuers.

现在让我们来看看由外行救援人员进行的早期心肺复苏术。