smudge|smudged|smudges

照片右上角有个模糊的污点，可能是镜头脏了。

There's a ___smudge in the top-right corner of the photo, probably from a dirty lens.

她的眼泪把画上的签名弄模糊了。

Her tears ___smudged the signature on the painting.

孩子用脏手在窗户上留下了好几道痕迹。

The kid left several ___smudges on the window with dirty hands.