单词: cell membrane 细胞膜 a very thin membrane, composed of lipids and protein, that surrounds the cytoplasm of a cell and controls the passage of substances into and out of the cell . 定义: 细胞的边界.有脂质,蛋白质,少量糖类组成,包围细胞质,控制细胞内外物质进出. 细胞膜成分: 脂质50%,蛋白质40%,糖2%-10