常見(jiàn)例句雙語(yǔ)例句A backup stem seal for a gate valve retains pressure in the body when the valve is in the closed position.一種用于閘閥的備用閥桿密封件，其在所述閥處于閉合位置時(shí)保 持閥體內(nèi)的壓力。ip.comThey stripped cells from a donated trachea, used it to replace the entire length of the damaged airway, and then used the child's own bone marrow stem cells to seal the airway in the body.他們剝離捐贈(zèng)者氣管的細(xì)胞，用這些細(xì)胞置換全部損毀氣道，然后利用患兒自身骨髓干細(xì)胞在體內(nèi)重構(gòu)氣道。 返回 body stem seal