die out

cease to existdisappear gradually and completely 灭绝;消亡;渐渐完全消失

Many old customs are gradually dying out.许多旧习俗正在日渐消失。

If too many of these rare animals are killedtheir kind will die out.这种稀有动物如遭大规模的捕杀就可能灭绝。


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