大规模毁灭 a mass extinction; mass destruction 关于太平洋核爆炸的卡塔赫纳协定 cartagena agreement on nuclear explosions in the pacific .
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This break in Earth's history is marked by a mass extinction, when as many as half the species on the planet became extinct.
地球历史上的这次重大灾难以物种的大量消亡为标志;当时,地球上多达一半的物种都灭绝了。
But the Mesozoic, too, began with a mass extinction.
但中生代本身便是以一次大灭绝开始的。
In this movie, a comet miles across is headed toward Earth, sure to cause a mass extinction if it hits.
在这部影片里,以颗直径几英里的彗星直奔地球而来,一旦撞上,就会是天崩地裂的大灾难。
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