alarm n.&v. /warn n.&v.

alarm的意思是“提醒，警告”，有使警覺，使做好準備的意思;warn的意思主要指“警告，告誡”，有事先告訴可能發(fā)生的事，警告說……的意思。

例：There were several alarms during the night but no actual air raid actually took place.

當夜，空襲警報拉響了數(shù)次，但并沒有飛機來襲。

He warned us that the road was icy.

他警告我們說道路很滑。