smudging

You've got a smudge on your cheek.

你脸有一块污迹。

The police identified the murderer from a smudge of blood on the shirt.

警方从衬血迹辨认凶手。

The police identified the murderess from a smudge of blood on the shirt.

警方从衬血迹辨认女凶手。

Charcoal drawings smudge easily.

木炭画很容易弄脏。

The signature was smudged.

签名被弄污了。