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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
The museum is a collection of mechanical games once played in salons , carnivals and boardwalk arcades.
这个博物馆收集了曾在联谊听、博览会和商店骑楼上供人娱乐的游戏机.
Caskets of jewels and coffers of gold.
一箱箱的珠宝与一柜柜的黄金.
On computer screens , canards and false impressions are very easy to create.
而在计算机屏幕上,错误的印象很容易发生.
Pass across our minds stretched like canvasses.
穿过我们画布般展开的大脑.
ConclusionIt may produce the new antihemorrhagic active constituent in carbonized Gardenia Jasminoides.
结论栀子炒炭后可能产生了新的止血活性物质.
Who is captaining the side today?
今天这队的队长是谁?
User: For grinding soybean milk and bean curd in canteens, schools and food supermarkets.
用途: 适用于部队 、 学校、机关食堂、食品超市磨制豆腐等.
Train all the catapults at this point, to the right of the gate.
全部石弩,运到这里, 对准门的右边.
The president asked the present cabinet to remain caretakers until the new cabinet is formed.
总统要求现任内阁成员继续留任直到下届内阁成立.
Two extra carriages were joined on the train at York.
火车在约克又挂上了两节车厢.
These carps are very big.
这些鲤鱼很大.
One in six Cariocas is poor.
里约市民六分之一是穷人.
Leaping is usually done with a springboard that catapults the performer high into the air.
跳跃运动通常利用能使表演者高高地弹入空中的跳板.
Lessening Impacts When Campfires Are Used.
低冲击的生造营火.