以下为句子列表：
英文: Over the periods their saliva, a mild, digestive juice like our own, was converted into a poison that defies analysis even today.
中文: 经过若干演化阶段，蛇的唾液，一种温和的助消化的象人们的唾液一样的液体变成了甚至在今天也难以分析的毒液。
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英文: Purification and Identification of Native Hirudin From the Digestive Juice of Leeches
中文: 抗凝血药物水蛭素的纯化与鉴定
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英文: Preliminary Study on the Activities of Protease in Digestive Juice of Pitcher Plant
中文: 猪笼草消化液中蛋白酶的活性初探
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