以下为句子列表：
英文: A suntan, she explained, was a defensive skin reaction to produce more of the pigment melanin to protect itself from too much harmful ultraviolet (UV) radiation.
中文: 她解释说晒黑是皮肤的一种防御反应，皮肤为了保护自己免受过多的有害的紫外线的照射产生更多的黑色素。
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英文: Accordingly, we began to ask what role melanin might play in human evolution.
中文: 于是，我们开始追问：黑色素究竟在人类演化史上扮演了什麽角色？
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英文: Aloe Xiong Kuo Kan effectively prevents the melanin the formation, whitening skin, rich elasticity.
中文: 芦荟熊果?铪陵芦?止黑色素的形成，令肌肤白哲细腻，富有弹性。
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英文: An anti-irritant, has a depigmenting effect as well as an inhibitory effect on melanin synthesis due to its ability to act as a tyrosinase inhibitor. Origin: Egypt. Suggested usage: 5%-10%.
中文: 美白、减少黑色素形成；杀菌、消炎、增强皮肤免疫力；修复细胞并皮肤所受到的刺激，舒缓敏感皮肤；抗氧化；同时具有吸收紫外线、抑制酪胺酸脢作用。产地：埃及。建议使用量：5%-10%。
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英文: Anthropologists and biologists have generally reasoned that high concentrations of melanin arose in the skin of peoples in tropical areas because it protected them against skin cancer.
中文: 人类学家与生物学家通常是这麽推论的：热带族群的皮肤里，黑色素浓度很高，因为黑色素能保护他们不会得皮肤癌。
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