any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes
proteins的用法和樣例:
例句
The proteins initially appear as discrete bodies. 蛋白質體最初作為分離體而出現。
Meat is an important source of proteins. 肉類是重要的蛋白質來源。