[Assistant] 42 US liquid gallons equals 672 US customary cups.

美国的42加仑液体相当于672美国特有的标准量杯。

And there is a metric for this.

这是有量标准的。

Now researchers have used that modern metric on ancient settlements.

现在，研究人员用现代量标准测量古代住宅。

Reason 3: And the final reason, time is an imprecise metric.

后一个原因，时间是一个不精确的量标准。

It happens gradually, along a metric known as the Norwood Scale, which describes the severity of hair loss.

它根据一个量标准逐渐发生的，这个量叫诺伍德分型，它描述了脱发的严重程。

A " car length" is not a standardized unit of measure.

" 身长" 不是个标准化的量单位。

Caterpillar said their switch to metrics saved them millions of dollars.

Caterpillar 表示，他们转向量标准为他们节省了数百万美元。

A new standard for weights and measures was  established, along with a state-run tax system that would keep local corruption to a minimum.

建立了新的量衡标准，以及将地方腐败降至低的国营税收。

Then I pick a key metric, and I ask myself if the metric is specific, easy to objectively measure, and representative of true progress towards my goal.

然后我选择一个关键的量标准，我会问自己这个量标准是否具体，是否容易客观地量，是否能够代表我朝着目标所取得的真正进展。

There is a useful measure used to rate the quality of the night sky by eye called the  Bortle Scale, which ranges from 1-9.

有一种实用的量标准， 用于通过肉眼评估夜空质量， 称为博尔特等级表，其范围从1到9。

Qin Shi Huang was the first Emperor of China, and he did a lot of stuff—unified China, built the Great Wall, standardized money, weights, and measures.

秦始皇是中国的第一位皇帝，他做了很多事情——统一中国，修建长城，标准化货币、量衡。

A useful metric therefore is the FEV1 to FVC ratio, which since the FEV1 goes down even more than FVC, causes the FEV1 to FVC ratio to go down as well.

因此FEV1与FVC的比值可以作为有效的量标准，因为FEV1值下降较多，它们的比值将会同时降低。

I find that a good metric has the following traits: it's very specific, it's easy to objectively measure, and a change in the metric indicates progress towards or away from my goal.

它非常具体，很容易客观地量，量标准中的变化表明了向着或背离我的目标的进展。

By the late Middle Ages, the Hindu-Arabic decimal system mostly replaced Roman numerals and fractions in Europe, but efforts by scholars like John Wilkins to promote standard decimal-based measures were less successful.

到中世纪晚期，印-阿拉伯十进系统在欧洲主要取代了罗马数字和分数，但约翰·威尔金斯等学者推广标准十进量的努力却不太成功。

He was a stickler for standardization. He wanted  the wheels on carts to be the same distance apart so the ruts in the road would be uniform. He  also standardized all weights and measures.

他是标准化的坚持者。 他希望手推上的轮相距相同，这样道路上的辙就会均匀。 他还标准化了所有量衡。