What causes our nose to randomly bleed?

是什么导致你鼻子不分地就流血了呢？

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

也就是刚割完草时那股味。

That's where the railway comes in.

这就是这条铁路。

It is tradition that dates back hundreds of years.

这一民俗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，但是我知这件事蹊跷。”

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

这条巨大峡谷，在2亿5千万年科罗拉多河侵蚀而成。

That's where the puffling patrols come in.

这就是海雀巡逻队。

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

克服精神痛苦法是不再把它仅仅视为一种没有麻烦。

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

你在想，“嗯，你结束聊天还是我？”

So that's where the challenge comes in.

这就是挑战。

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

现在让我们看看两个单词构成every day。

So this is the source of the word, Pygmalion.

这是这个词。

And that is where our expression comes in.

这就是我们表达。

And that's how it came to be.

这就是它名称。

Which is exactly where the doors come in.

这正是飞机舱门。

That's how the Educove platform came to be.

这就是Educove平台。

That's where the Soviet Union comes from.

苏维埃就是苏联。

And that was the reason for leafing day.

这就是叶子节。

In time, it will become known as Thanksgiving.

那就是感恩节。

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

现在让我们看看外行救援人员进行早期心肺复苏术。