Cytoplasmic membrane, or cell membrane, plasma membrane, is a soft, fragile and flexible semi-permeable membrane, which underlines cell wall and surrounds cytoplasm.

• 细胞质膜：也称细胞膜，是一层紧贴细胞壁内侧，包围细胞质的柔软、脆弱而有弹性的半透性薄膜。