But this only works if our sample is randomly drawn from the population.

但这要求我们抽取样本 要完全随机。

And we're going to choose one, good one to work in tomorrow's show.

我们会在评论区抽取一个留言参与明天的节目。

And we'll choose a winner to work in to tomorrow's show.

我们会在评论区抽取一个留言参与明天的节目。

The principle of extracting raw silk hasn't changed since it's discovered.

抽取生丝的原理，从发现至今并没什么改变。

Another thing that takes a lot of pumping air around, he says?

他说，另外一件需要抽取大量周围空气的情是什么？

Or put another way, " It's a lot of air you pump around."

或者换句话说，“这就是你从周围抽取了大量的空气。”

However, that supply is threatened by over-extraction and contamination.

但由于过度抽取和污染问题，地下水资源面临危机。

We put a little of each paycheck away for a rainy day.

我们会从每次的收入中抽取一部分攒起来，以备不时之需。

Drivers are matched with shippers, and 99 takes a cut.

司机与托运人相匹配，而 99 公司从中抽取佣金。

Gasoline is refined from crude oil, a fossil fuel extracted from deep underground.

汽油是从原油中提炼出来的，原油是从地下深处抽取的化石燃料。

I'm sorry… ? Did you say " extracting sunbeams … from… cucumbers" ?

不好意思......？你刚刚是在说“从......黄瓜里......抽取阳光”？

The problems start here with extraction and production where oil is used to make water bottles.

那个问题从石油的抽取和生产过程就开始了，而石油正是用来制作水瓶的。

When the children were four months old, Dr Andersson re-examined them and took a blood sample.

在这些儿童四个时，Andersson博士重新对他们进行检查并抽取血样。

That's because of a strategy shift that allows more shots to be drawn from each vial.

这是因为战略的变化，从每个瓶子抽取的皮内注射剂量较小。

So what we do is we pull some air from your hotel room, we pull the air from the space.

我们的做法就是从空间抽取空气。

That is because they get up to 30 percent of the money from the sales in their app stores.

究其原因，这两个平台会抽取30%的佣金费。

This expression comes from a drawing--a contest where names or numbers are randomly chosen for a prize.

这个表述来自抽奖--在比赛时中奖的姓名和数字都是随机抽取的。

Scientists hope to uncover some of the solar system secrets on the samples vacuumed from Bennu's surface.

科学家们希望通过从本努表面抽取的样本揭示一些太阳系的秘密。

The United Nations says India drills and pumps more groundwater than the United States and China combined.

联国称，印度钻探和抽取的地下水比美国和中国的总和还要多。

Jakarta is sinking. The main cause is that too much of the city's ground water has been pumped out.

因为雅加达在不断下沉。主要原因是，该市的地下水被过度抽取。