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的用法和样例:
例句
The proteins initially appear as discrete bodies. 蛋白质体最初作为分离体而出现。
Meat is an important source of proteins. 肉类是重要的蛋白质来源。