Mercury is a liquid metal, and mercury, the planet, is the fastest moving naked eye heavenly body. Mars, iron, why is Mars red?
水银是液态金属,水银,行星,是肉眼能看到的运动最快的天体,火星,铁,为什么火星是红色的?
It's a protein that's produced by other cells in the body and when it's enriched in a certain area it stimulates more production of red blood cells.
这种蛋白由体内的另一种细胞生成,而当其在某处富集时,就会刺激红细胞生成
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