现在的研究无法做出伤害人体的实验，以至于无法得出究竟多少的晒日可以尽可能产生维生素D而不至于对健康产生患皮肤癌的风险。
There is no current research available that provides a safe limit for sun exposure to maximize vitamin D production that does not put the individual's health at risk for developing skin cancer.
日本一项实验显示褪黑素能减轻辐射对人体所产生的危害。
An experiment in Japan found melatonine can lessen the harm done by radiation to the human body.
日本开始挖掘人体实验的旧址。
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