以下为句子列表：
英文: 121 At various times in the geological past, many species have become extinct as a result of natural, rather than human, processes.
中文: 在过去不同的地质时期，很多物种的灭绝都是自然因素造成，而并非人类行为。
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英文: A lot of birds are extinct now.
中文: 许多鸟兽现已绝种。
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英文: A species becomes extinct when the last individual dies.
中文: 当最后一个个体死了，一个物种灭绝。
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英文: A species would be extinct if they can't produce their descendants during every generation.
中文: 一个动物物种如果不能在每一代生育足够数量的后代,那它就要灭绝.
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英文: Adding this reagent to seven kinds milled rice with different fatty acid values, it is hind that the extinct in fresh rice became green and the extinct in aged rice became yellow.
中文: 将试剂加入7种不同脂肪酸值的大米样品中，新鲜大米浸出液为绿色，陈化大米浸出液为黄色。
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