plunge method

例句：

1. 1.The swimmer plunged into the water with great force.
   游泳者以极大的力量跳入水中。
2. 2.The car plunged down the mountainside.
   汽车沿着山坡急速下坠。
3. 3.She plunged into the ocean to save a drowning child.
   她跳入海中去救一个溺水的孩子。