smudging

You've got a smudge on your cheek.

你脸上有一块污。

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

警方从衬衫上的血凶手。

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

警方从衬衫上的血女凶手。

The signature was smudged.

签名被污了。

Charcoal drawings smudge easily.

木炭画很容。