* plunge 2
v.（使）突然向前倒下（跌落）
Both the climbers had plunged to their deaths.
两位攀登者都坠地身亡。
* plunge 1
v.〔价格、比率等〕暴跌，骤降
Oil prices have plunged to a new low.
石油价格创了新低。

* dive 1
v. 我们一头跳进河里，凉快一下。
We dived into the river to cool off.
我们一头跳进河里，凉快一下。
* dive 2
v. (戴呼吸装备)潜水
to dive for pearls
潜水采珠
* dive 3
v.〔数字、价格等〕暴跌，突降
The dollar dived against the yen in Tokyo today.
今天，东京美元对日元比价暴跌。