锐减的英文：
to decline sharply; to drop markedly

参考例句：

The number of tigers has reduced abruptly in the last fifty years
在过去的五十年里，老虎的数目锐减。

The volume of annual exported craftwork to Japan dropped drastically last year.
去年销往日本的工艺品数量锐减。

In my love-lorn condition, my appetite languished
在我这种苦害相思的日子里，我的食欲锐减。

This sudden cold spell has knocked the bottom out of the market for seasonal items like ice cream and suntan oil.
突来的寒流使得一些季节性商品如冰淇淋和防晒箱等的销售锐减。

decline是什么意思：
n. 下降；减少，衰退，衰落，最后部分；晚年，倾斜
v. 下降，下跌；减少；倾斜；婉拒；使降低，使变格

sink into a decline
开始衰落，衰弱下去，体力衰退

The population is on the decline.
人口在减少。

The decline of literature indicates the decline of a nation.
文学的衰落表明一个民族的衰落。

sharply是什么意思：
adv. 锐利地；急剧地；严厉地；明确地

The road curved sharply to the right.
道路有个急转弯拐向右边。

Dad had braked sharply.
爸爸紧急地刹了车。

The bank sloped down sharply to the river.
河岸到河面的斜坡非常陡。

drop是什么意思：
v. 落下；降低；垂下；停止；终止；放弃；与…断绝联系
n. 落差；球状糖果；珠，滴；少量

A small amount of liquid;a drop.
少量液体；一滴

low-velocity drop
低速度空投

high velocity drop
高速度空投