We see phellem below microscope, it is by by tens of thousands be just as alveolate to do cellular composition, air was filled inside the cell, formed many a airtight gasbag.

• 我们在显微镜下看软木组织，它是由成千上万个如同蜂窝状的干细胞组成，细胞内布满了空气，形成了一个一个的密闭气囊。