英文釋義
any of various naturally occurring extremely complex substances that consist of amino-acid residues joined by peptide bonds, contain the elements carbon, hydrogen, nitrogen, oxygen, usually sulfur, and occasionally other elements (such as phosphorus or iron), and include many essential biological compounds (such as enzymes, hormones, or antibodies)
例句 Example
Fish was a major source of protein for the working man.
魚肉曾是勞動者的主要蛋白質來源。