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.

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Natural catastrophes remain unpredictable, in spite of huge technical and scientific advances.

尽管科技取得了巨大的进步,自然灾害仍然是不可预测的.

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Population size may also be reduced by density independent factors a category that includes natural catastrophes.

群体规模也可因为密度无关因子而降低,包括自然灾难.

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A series of natural catastrophes was remarked as a sign of warning from the earth.

一连串的自然(大灾难,大祸)被视为地球发出的警告.

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