Now the next unit of time to define after the day would be the month.

现在，在计算完天之后要定义的下一个时间单位是月。

But before jumping to the full day, let's begin with the smaller unit of time — the second.

但是在跳到完整的一天之前，让我们从更小的时间单位——秒开始。

" Minutes" can be a unit of time.

“分钟”可以是时间单位。

And how can we scientifically define this fundamental unit of time?

我们如何科学地定义这个基本时间单位？

And power is work divided by time, so how much work can be done per unit of time.

而功率是功除以时间，所以单位时间内能做多少功。

For the time scale of the course, you can say the number, dash, and then the unit of time, and that together forms an adjective.

描述课程时间长度，你可以说数字、杠，然后跟时间单位，共同构成一个形容词。

However, when it was first defined, the second was more of a mathematical idea than a useful unit of time.

然而，当它第一次被定义时，秒更像是一个数学概念，而不是一个有用的时间单位。

They took this old unit of time, based on something that might change every day and changed its definition using something that never changes, physics.

他们用这个旧的时间单位，基于可能每天都在变化的东西，并用永远不变的东西改变了它的定义，物理学。

The third thing you need in a clock is a way to split up that heartbeat into different units of time.

时钟中需要的第三件事是将心跳分成不同的时间单位。

So, history had invented this basic unit of time based on a fraction of a day, and then scientists came along with all this new, precise mathematical astronomy, and realized that definition stunk.

所以，历史发明了这个基本的时间单位，基于一天的一小部分，然后科学家们带来了全新的，精确的数学天文学，并意识到这个定义很糟糕。

It isn't the numbers on a clock that keep our society functioning on time, measuring the basic unit of time is far more critical, the hidden anchor at the foundation of modern life.

让我们的社会按时运转的不是时钟上的数字，测量基本的时间单位要重要得多，它是现代生活基础上的隐藏锚。

That is a unit of time so short that there are as many attoseconds in a second as there have been seconds since the Big Bang, 13.8bn years ago.

这是一个非常短的时间单位，一秒内的阿秒数与 138 亿年前大爆炸以来的秒数一样多。

And finally: " our" , " o-u-r" which is the first person plural possessive and " hour" , which is the unit of time that runs to 60 minutes.

最后：“我们的”，“o-u-r”，这是第一人称复数所有格和“小时”，这是运行到 60 分钟的时间单位。

And he decided to move to Boston, because he figured that, that was the highest number of interactions that would occur per unit of time in the areas that he cared about.

他决定搬到波士顿，因为他认为那是他关心的领域每单位时间发生的最多互动次数。

" The better part of something" means " most of something" or " a lot of something" or " a big portion or percentage of something." We usually use this with units of time.

“某物的更好部分”的意思是“某物的大部分”或“某物的很多”或“某物的很大一部分或百分比”。我们通常将其与时间单位一起使用。