急剧的英文：
rapid
sudden

参考例句：

a sharp drop;a sharp turn.
急剧地坠落;急转弯

The utility of the isogloss is sharply reduced in sociolinguistic.
同言线在社会语言学中的应用急剧减少。

Mr Powell Taylor says that depopulation exacerbates the problem.
鲍威尔·泰勒先生说人口的急剧减少使得该问题更加严重。

Arise suddenly and intensely
急剧上升

a precipitous drop in commodity prices.
商品价格急剧下跌。

His temperature jumped sharply.
他的体温急剧升高。

To strike sharply;rap.
叩击急剧撞击;叩击

To drop sharply and rapidly; plummet
急剧下跌;骤降

To surge up.
增长，急剧上升，高涨

The price of fuel took a steep climb.
燃料价格急剧上涨。

rapid是什么意思：
adj. 快速的，急促的
n. 急流

run the rapids.
冲过急流

biological section rapid treater
生物切片快速处理仪

shooting the rapids in a ruBBer raft.
使橡皮充气船快速行驶

The currency has devalued at a rapid rate.
货币已经以很快的速度贬值了。

The rapid change has been astounding.
巨大的改变已令人吃惊。

sudden是什么意思：
adj. 突然的，意外的；快速的
n. 突然发生的事

A sudden loud blow or bump.
砰然作响发出砰一声的猛击或猛撞

A sudden, striking surprise;a twist.
意外发展突然的、惊人的变化；意想不到的转折

Hasty climbers have sudden falls
大起者有大落

go into a sudden nosedive
突然俯冲.

Meleager felt a sudden pang.
墨勒阿格突然觉得一阵疼痛。