Brazil's deforestation rate has dropped astoundingly fast.是什么意思？

Brazil's deforestation rate has dropped astoundingly fast.

因为巴西的森林砍伐率下降之快令人震惊.

deforestation

n. 采伐森林，森林开伐；

例句
Brazil's deforestation rate has dropped astoundingly fast.
因为巴西的森林砍伐率下降之快令人震惊.

rate

n. 速度，比率，等级，（利息等的）费率；vt. 估价，值得，责骂，定级；vt.& vi. 认为，把…算作；vi. 被评价，被认为，被列入，申斥；

例句
The rate of inflation is running at about 2.7 percent.
通货膨胀率大约为2.7%。

has

v. 有( have的第三人称单数 )，（亲属关系中）接受，拿，买到；

例句
...the operation a patient has had.
病人做过的手术

dropped

v. 落下（ drop的过去式和过去分词 ），降低，减少；

例句
He dropped his sausage on the pavement and someone's dog ate it, mustard and all.
他把香肠丢在人行道上，不知是谁家的狗将香肠甚至连带芥末都吃个了精光。

astoundingly

adv. 令人震惊地；

例句
Even about death the Egyptians were astoundingly practical.
即使对于死,埃及人民也是异乎寻常地讲求实际.

fast

adj. 快的，走得快，感光快的，紧的；adv. （比准确的时间或宣布的时间）快，迅速地，紧紧地，彻底地；vi. 禁食，（尤指）斋戒；n. 禁食期，斋戒期，断食，节食；

例句
He's taking a dangerous drug: it acts very fast on the central nervous system...
他正在服用一种危险的药物：这种药物能很快影响到中枢神经系统。