Give me your hand while we cross the road.

　　過馬路時拉著我的手。

　　We spent a good while looking for the house.

　　我們花了好長時間找這房子。

　　I'll keep you company while you're waiting.

　　你等待時我會陪伴你。

　　Most students face the problem of funding themselves while they are studying.

　　大多數(shù)學(xué)生在求學(xué)期間都會面臨經(jīng)濟來源的問題。

　　The temperature remained constant while pressure was a variable in the experiment.

　　做這實驗時溫度保持不變，但壓力可變。