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。

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

抽取丝的原理，从发现至今并没什么改变。

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

我们从每次的收入中抽取一部分攒起来，以备不时之需。

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

我们在评论区抽取一个留言参与明天的。

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

我们在评论区抽取一个留言参与明天的。

His code kicked in only if the coming drawing fulfilled a narrow set of circumstances.

他的代码只有在抽取满足有限的条件时效。

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事情是什么？

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。

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。

We take energy out of the system at the end, and that's the ride.

我们在最后从系统中抽取能量，这就是过山车的一次旅程。

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”？

Co-injections might add fluid to tissue, they might draw fluid out, they'll add color.

共同注射可能向组织中添加液体，他们可能抽取液体，他们增加颜色。

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。

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.

在这些儿童四个月时，Andersson博士重新对他们进行检查并抽取血样。

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'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。

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。