catastrophes例句

Two of history's worst natural catastrophes occurred in 1970.
1970年发生了历史上最严重两次自然灾害.

The Swiss deposits contain evidence of such catastrophes.
瑞士的遗址里还有这种灾难的证据.

Periodic local catastrophes reduce populations.
周期性的局部地区的灾变降低了种群的数量.

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