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Periodic local catastrophes reduce populations.是什么意思？

Periodic local catastrophes reduce populations.

周期性的局部地区的灾变降低了种群的数量.

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；
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