日期:
来源:雅诚德英语网
Scientists focused on the pigment melanin, which gives human skin its color.
科学家们集中于研究黑色素,就是他们使人类的皮肤具有颜色。
Scientists focused on the pigment melanin, which gives human skin its color.
科学家们集中于研究黑色素,就是他们使人类的皮肤具有颜色。