It emerged from a unique history in which chance and accident often played a vital part.
它出现在这段独特的历史中,其中机遇和偶然性扮演了重要角色
It's very important because it provides-- does provide energy but it helps with muscle building and with the manufacturing the body does of its own proteins, and therefore, is a vital part of the diet.
蛋白质非常重要,因为它能提供,的确能提供能量,但它也能帮助肌肉塑形,参与身体内自身蛋白的合成,因此是饮食中不可或缺的组成部分
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