不能随便践踏青苗。

One should not tread on young seedlings.

践踏公认的国际法准则

trample on accepted principles of international law

不许任意践踏别国的主权

cannot trample on the sovereign rights of another country as one pleases

在旧社会人民的权利受到了践踏。

People's rights were trampled on in the old society.

凭借势力践踏乡邻

use power and influence to trample one's neighbours underfoot