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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
Description: casters splint type: EF - 1000 B color: black application: used for casters installation.
品名: 脚轮上夹板型号: EF-1000B颜色: 黑色应用: 用于脚轮安装.
This enzyme catalyzes the oxidation of succinic acid.
这种酶催化琥珀酸的氧化.
Cabbages, caraways, radishes , all emerged stealthily , afraid of lagging behind.
先是小白菜 、 香菜、水萝卜, 争相悄然而出.
Inclined haul - off capstans of 2500 double haul - off unit ensure the stranded wire running straightly.
双主动牵引,倾斜的牵引,能保证绞合后的电缆直线运动.
The invaded systems are cannibalizing their own components to fuel their growth.
侵略系统在利用他们同类的部件来供给他们成长.
I stared, trying to grasp the point of the picture and the captions.
我目不转睛地看着漫画, 想弄清楚漫画和解说词的意思.
That night there were a thousand campfires.
晚上点起上千堆营火.
Shawls, capes, and furs are wraps.
披肩 、 斗篷和皮衣都是披在身上用的.
They canoed across the river.
他们划着小舟过河.
This process sometimes is called capitalizing retained earnings.
这一过程有时被称为留存收益的资本化.
In the army, lieutenants are subordinate to captains.
在陆军中, 中尉是上尉的下级.
In reality, there are leakage resistances and stray capacitances and to everything.
但在实际应用中, 它们与其它部分之间会存在漏泄电阻和寄生电容.
Good, an iced fruit jelly and a caramelized apple.
服:好的, 一份冰镇果羹,一份拔丝苹果.
The Caretakers'telephone number is 2745.
服务员的电话是6672745.