And do them with a clock, right, time yourself under exam conditions.

用钟，就像在考试那样，给自己。

Use timer tab to set countdown clock going on my browser.

用器选项卡设置浏览器上的倒钟。

Imagine that you set a timer for that many seconds.

想象一下，你设置一器，让它么多秒。

UNIDENTIFIED MALE: Our countdown for Apollo 11, now five minutes, 52 seconds and counting.

阿波罗11号倒5分52秒，开始倒。

Saturday, it unveiled a countdown clock marking 1000 days until the games began.

周六，日本倒钟揭幕，离奥运会倒1000天。

So we're going to put a little Stopwatch on.

我们来设器。

Yeah. So the term pulsar timing array implies we're timing these pulsars.

好的。“脉冲星阵”词意味着我们在为些脉冲星。

Three minutes. And he used a kitchen timer. I felt like a softboiled egg.

三分钟，他用了一厨房器，我觉得自己就像一颗溏心蛋。

It's how long you've got to live.

你生命的倒。

When we start again, it'll be the countdown...

接下来是倒数。

The circadian rhythm is like a clock or timer.

昼夜节律就像钟表或器。

The Pomodoro technique makes use of a timer.

番茄工作法会用到一器。

MLB is implementing a pitch clock, sort of like a shot clock in basketball.

美国职业棒球大联盟正在实施一项新的比赛规则，有点像篮球比赛的方法。

OK, I'm just going to start my watch.

好吧，我要开始了。

And what happens if it hits zero?

如果倒到零会怎样？

It's the last big day of primaries in the 2016 presidential race.

2016总统初选进入倒。

“Where did you get that hourglass thing? ”

“你从哪里得到器的？”

When you feel something like this, stop the timer.

当出现种感觉后，停止。

And then it automatically starts timing down.

然后它会自动开始。

Can you shut off the timer?

能停掉器吗？