But HEPA filters cannot remove disease-causing particles smaller than zero point three microns.

VOA: special.2009.07.14

They might be 100 nanometers or so in diameter, whereas, a cell is ten microns or so in diameter.

直径只有一百纳米左右,而一个细胞的直径是十微米左右

耶鲁公开课 - 生物医学工程探索课程节选

Bacterial cells are small, one to two microns in diameter and this shows a picture of a common bacterium called E. Coli.

细菌细胞很小,直径只有一到两个微米,这张图片是一种常见细菌,大肠杆菌

耶鲁公开课 - 生物医学工程探索课程节选

Because of that you can't count on molecules moving rapidly over the size of a cell that's ten to 30 Microns in diameter.

因此不要对生物大分子能在,直径十到三十微米的,细胞里高速穿行抱有任何指望

耶鲁公开课 - 生物医学工程探索课程节选

It's much larger than a bacterium, it's ten to 30 microns let's say instead of one to two microns, so almost ten times bigger.

人类细胞比细菌大得多,有十到三十微米那么大而不是一两微米,几乎大了十倍

耶鲁公开课 - 生物医学工程探索课程节选