Minutes. I mean, its half-life is decreasing exponentially.

它的半衰期每分钟正以指数递减。

And yet, a year or two later, you were there with a medicine

因为它的半衰期只有45分钟。

5,730-year half-life of carbon-14 is used as a geochronometer.

碳14的5730年的半衰期被人们用来当做地质时标。

The 5,730-year half-life of carbon 14 is used as a geochronometer.

碳14的半衰期是5730年，它可以作为地质时标。

Maybe it'll even be exciting enough to tempt valve into making Half-Life three.

或许它甚至足够 Valve 制作《半衰期3》。

They leave our body with a half-life of four hours, six hours, so very quickly.

它们们的身体的半衰期是4小时，6小时，所以很快。

In today's world, the half-life of a technical skill is roughly 2.5 years.

在当今世界，一项技术技能的半衰期约为 2.5 年。

The half-life of such an event is at least 1034 years, and it's almost certainly longer.

这种事件的半衰期至少是1034年，而且几乎可以肯定会更长。

Taken by itself, cocaine has a short half-life and is almost completely metabolized by the liver in about an hour.

可卡因本身半衰期很短，1小时内几乎完全被肝脏代谢。

And how to make calculations based on an elements half life.

以及如何根据元素的半衰期进行计算。

Now, it has a very short half-life in the body.

现在，它在体内的半衰期非常短。

But now the half-life of that advantage has shrunk to just one year.

但现在这种优势的半衰期已经缩短到只有一年。

In any case, a lie’s half-life is manageable.

无论如何， 谎言的半衰期是可以控制的。

The half-life of that is short.

DB：它的半衰期很短。

The liver is quick to metabolize and eliminates nicotine from the body; in fact, it's half-life is only about 1-2 hours.

尼古丁的半衰期其实只有1-2小时，肝脏可以快速代谢掉体内的尼古丁。

Now you've heard of half life, it's the measurement that tells us just that.

现在你已经听说过半衰期了， 正是测量告诉们这一点。

Different nuclei have different half lives.

不同的原子核有不同的半衰期。

The half-life of plutonium, in other words the time it takes for half of the plutonium to disappear, is 245,000 years.

钸的半衰期，换句话说，要让半数的钸消失需要245000年的时间。

Dexamethasone is the glucocorticoid of choice because of its low mineralocorticoid effect and long half-life.

地塞米松是首选的糖皮质激素，因为它的盐皮质激素作用低且半衰期长。

And these designer cancer T cells, CAR T cells, have a calculated half-life of more than 17 years.

而这些设计癌症T细胞， CAR-T细胞，计算的半衰期超过17年。