乱涂乱画公物是违法的。

It is illegal to vandalize public property.

他们可以随心所欲地在墙上乱涂乱画。

They were free to scribble on the walls whatever came to their mind.

莎拉在纸上乱涂乱画。

Sarah is doodling on a piece of paper.

在钞票上乱涂乱画是违法的。

It's illegal to deface banknotes.

除去人行隧道墙上乱涂乱画的痕迹*

Remove graffiti from the subway walls

他们打碎陶器，开启灭火器，还在墙上乱涂乱画。

They smashed crockery, set off fire extinguishers, and drew grafitti on the walls.