例句：
He dived in after her without a second thought.
他不假思索地随她跳入水中。
The plane made a dive to a lower altitude.
飞机俯冲到较低高度。
He dived below the surface of the water.
他潜入了水中。
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。