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周期性的局部地区的灾变降低了种群的数量.用英语怎么说？

周期性的局部地区的灾变降低了种群的数量.

Periodic local catastrophes reduce populations.

相关词汇
periodic local catastrophes reduce populations

periodic

adj. 周期的，定期的，回归的，间歇的，时而发生的；

local

adj. 地方的，当地的，本地的，局部的，褊狭的；n. 慢车，本地居民（律师、教士、医生），住处附近的当地酒店，本地新闻；

catastrophes

n. 灾祸( catastrophe的名词复数 )，灾难，不幸事件，困难；

reduce

vt. 减少，缩小，使还原，使变弱；vi. 减少，节食，蒸发，（液体）浓缩变稠；

populations

n. 人口( population的名词复数 )，全体居民，特定人[动物]群；
热门例句
He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
使飞机减速的螺旋形气流涡旋
You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
相关例句
It is applied for the early large carbuncles, with accumulated hot toxin and Qi blood stasis.
仙方活命饮应用于痈疡肿毒初起, 热毒壅聚,气滞血瘀.
The divers were capsuled in a submarine.
潜水者们被包覆在潜艇里.
Between them they finished cutting three carloads of macaroni stalks.
他们协力割下了3车通心粉秸.
The newest wrinkle in the $ 2.5 billion cosmetics business is a lotion that camouflages creases.
二十五亿化妆品生意中最新的一招是一种能够掩饰皱纹的润肤液.
The company has produced caskets up to 7 feet square.
该公司有生产过大到二米见方的棺材.
As with any wiring arrangement, there are leakage resistances and stray capacitances between the conductors.
和任何线路布局一样, 在导线之间都会存在漏泄电阻和寄生电容.
The new books are being cataloged.
新书正在编目.
The former is said to come within the realms of orthodox descriptive cataloguing.
前者一般认为属于正统的描述性编目范畴.
You can make soup by boiling chicken carcasses.
你可以用鸡骨架烧汤.
These carps are very big.
这些鲤鱼很大.
Capitalizes the first letter of words in the selection.
将所选内容中文本单词的首字母改为大写.
This is Who's Really Who skilfully capsuled.
这是《名人实录》一书的小巧的节略版.
Switzerland is made up of 22 cantons.
瑞士是由二十二个州所组成的.
The new books are being catalogued.
新到的图书正在编目.