Don't litter up the floor with scraps of paper.

不要在地板上乱扔纸屑。

《新英汉大辞典》

Don't litter up the room.

不要在房间里乱丢东西。

youdao

If you see litter in the corridor, pick it up.

如果你看到走廊里有垃圾，就把它捡起来。

《柯林斯英汉双解大词典》

Halle Berry said she would pick up litter in the streets to clear his path.

ECONOMIST: The presidential race

Offenders are ordered to carry out work such as picking up litter, renovating community centres and clearing undergrowth and graffiti for local communities.

BBC: Community service plan 'failing'

He said Talacre was the last beach before the Dee estuary, which led to litter being washed up by the tide from other beaches.

BBC: NEWS | UK | Wales | North East Wales | Beach faces tide and untidyness