以下为句子列表：
英文: Scientists have known for some time that a steroid breakdown product of progesterone is a powerful sleep inducer that, in higher doses, can have analgesic, anticonvulsant and even anesthetic properties.
中文: 黄体激素分解后的产物中，有一种类固醇，是强有力的催眠剂，剂量高一点，就可以当作止痛剂、抗惊厥剂，甚至麻醉剂，这是科学家知道好一阵子的事。
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