All of complex life is in one hand, and in a single stroke with a medium-grained nail file you could eradicate human history.

全部复杂生命都在一只手里，“你只要拿起一把中度粒面的指甲锉，一下子就可以锉掉人类历史”。

After that, I'll need my nail clippers, nail file, and tweezers to do my nails and my plucking.

安娜：在那之后，我需要我的指甲剪、指甲锉和镊子来修指甲和拔毛。

I left out my elephant mug and my lady-curve nail file. They better not have stolen them!

我忘了我的大象杯和我的女士曲线指甲锉。他们最好不要偷走它们！

If you took a nail file and shaved off just a little bit of your nail, that would be all of human existence.

如果你拿一把指甲锉， 只剃掉一点点指甲，那就是人类存在的全部了。

A " nail file" (file) is a small tool, usually a flat little stick that is rubbed against the nails in order to make them smooth after you cut them, I guess.

“指甲锉” （锉刀）是一种小工具，通常是一根扁平的小棍子， 用来在指甲上摩擦， 以便在你剪指甲后使它们光滑， 我猜。