1.lack of obstruction indicates that smell impairment is nonreversible.
缺乏梗阻表明，嗅觉障碍是不可逆。
2.Fit the nonreversible plug into the cord socket and plug the machine in to the power supply.
将不可逆的插头插入带线插座，缝纫机的电源插头插入电源插座。
