Underneath the cell wall, there's the plasma membrane which is the most important layer because it encloses the cytoplasm and defines the cell having important roles such as respiration, photosynthesis, and the synthesis of lipids and cell wall constituents.

细胞壁下方是质膜，而这是最重要的一层，因为它包围细胞质，限制了细胞，具有呼吸、光合作用以及脂质和细胞壁成分的合成等重要功能。