If you're trying to avoid wrinkles just know that 68 nanograms of Botox is lethal.

如果你想避免皱纹的出现，只要知道68毫微克的肉毒杆菌是致命的。

And the analysis procedure used for this study can measure traces of turkesterone down to nanograms.

这项研究中使用的分析程序可以测量至微量的土克甾酮，精确到纳克。

Less than a hundred nanograms — that's billionths of a gram — is enough to kill an adult.

只有不到 100 纳克——大约只有十亿分之一克——已经足够送一个成年人去阎王爷了。

You see, there’s about 630 nanogram of amphetamines per liter of water according to scientists.

你看，根据科学家的说法， 每升水大约含有 630 纳克苯丙胺。

So, two questions: what are nanograms and how much drug is there in my tea.

所以，有两个问题：什么是毫微克以及我的茶中含有多少药物。

Ketamine, a powerful painkiller, had an even more dramatic rise, reaching more than 9,500 nanograms per liter of water during the festival.

氯胺酮是一种强效止痛药， 其含量上升幅度更大，在节日期间达到每升水 9, 500 纳克以上。

The toxin, 40 million times stronger than cyanide, can kill a human at only 80 nanograms - 2-billionths of a gram.

这种毒素比氰化物强 4000 万倍，仅需 80 纳克 - 十亿分之二克就可以杀死一个人。

The levels of gold and silver were very small, in the micrograms, or even nanograms, but when you add them up it's pretty substantial.

“虽然金银的数量很少，微克甚至毫微克，但是它们加起来后的数量相当可观。”

One is called Polonium-210, so dangerous that if you inhale just 620 nanograms, about the same as two to three grains of pollen, you would die an agonizing death.

一个是钋-210，致命到如果你只吸入 620 纳克，也就是相当于二到三粒花粉的分量，就会极度痛苦地死去。

The law defines marijuana intoxication as five or more nanograms of THC - the active ingredient in marijuana - in a person’s blood stream.

法律将大麻中毒定义为人体血液中含有五纳克或更多 THC（大麻中的活性成分）。