dive for (v.+prep.)；
dive in (v.+adv.)；
dive into (v.+prep.)；
dive off (v.+prep.)；
make a dive for
Profits really took a dive last year.
去年利润确实突然下降了。
He dived in and hit his head on the bottom.
他跳进水里，头撞到了池底。
He dived in to save the dog at considerable risk to his own life.
他冒着相当大的生命危险跳到水里去救那只狗。
