In one microliter or cubic millimeter, there are normally a few white blood cells, up to 5.

在一微升或一立方毫米之中，通常有几个白细胞，最高达到5个。

In most bacterial cases, there'll be above 100 white blood cells per microliter, and more than 90% PMNs.

在多数细菌致病的情况下，会有之前所说的每微升100个白细胞的情况，同时会有超过90％的中性粒细胞。

It's a million times smaller than microliters.

它比微升小一百万倍。

Our bodies are teeming with leukocytes: there are between 4,000 and 11,000 in every microliter of blood.

我们的身体充满了白细胞：每微升血液中有 4, 000 到 11, 000 个白细胞。

Over time, a microliter of CSF might go on to contain up to thousands of white blood cells, but any more than five usually defines meningitis.

随着时间的推移，一微升脑脊液内的白细胞数量可能会达到数千，但任何超过五个白细胞的现象都会诊断为脑膜炎。

And now we are at the picoliter-sized droplets, so way smaller than a milliliter that you can still see or a microliter that you can barely see.

现在我们是皮升大小的液滴，比你仍然可以看到的毫升或你几乎看不到的微升小得多。

The highly sensitive face mask is capable of measuring trace-level liquid samples of 0.3 microliters and gaseous samples at an ultra-low concentration of 0.1 femtograms per milliliter, according to the study published this week in the journal, Matter.

根据本周发表在期刊《Matter》上的一项研究，这款高灵敏度的口罩能对 0.3 微升的含有病毒蛋白质的液体做出反应，该口罩还能检出超低浓度（0.1fg/ml，即 1ml 空气中的 1000 万亿分之一克）的气体介质样本。