442　listen to和listen for

① listen to意为“听，倾听”。

They listened to the teacher attentively. 他们注意听老师讲课。

② listen for意为“等着听，期待听到”。

He listened for her knock at the door. 他期待听到她的敲门声。

They listened for the clock to announce the new year. 他们等着听钟声迎新年。