Because eggs contain a balanced source of amino acids (building blocks of proteins), they are considered the gold standard by which all protein foods are measured.
因为含有均衡的氨基酸来源(氨基酸构成蛋白质)，鸡蛋被看作是衡量所有蛋白质食物的黄金标准。
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They then dipped the gold into a solution containing the protein, allowing it to bind to the treated squares, and dunked the whole lot into a heated solution of iron salts.