But ethanol and isopropanol are teeny.

但是乙醇和异丙醇很小。

But now surround it with a high concentration of an alcohol, like the ethanol or isopropanol found in most hand-sanitizers.

但是现在，我们用高浓度酒精，也就是多数免洗洗手液都含有的乙醇或异丙醇裹住它。

Usually, markers use ethanol, which is the kind of alcohol people drink, or isopropanol — aka rubbing alcohol — because they evaporate quickly.

通常来说，马克笔使用的是乙醇，也就是人们喝的那种酒精，或异丙醇，也称为医用酒精，因为它们会迅速蒸发。

Usually, markers use ethanol, which is the kind of alcohol people drink, or isopropanol—aka rubbing alcohol—because they evaporate quickly, which means it's harder to accidentally smudge whatever you've just written.

通常记号笔会用乙醇或异丙醇制作——乙醇是一种可食用酒精，而异丙醇又名医用酒精。这是因为它们挥发较快，无论你刚写下什么，都没那么容易无意中抹脏。