• 抽空泵

returnedadj.归还的；归来的动词return的过去式和过去分词.returnv.返回；归还；回报；回应；申报n.归还；返回；（收益)回报；申报return promptly迅速归还Return oil pipe回油管道returning board选举监察所returning curve回复曲线return interval回程时间,复元时间return to China回国returning scrap铁屑returning route回归线路return of scale规模效益return expenses[经] 来回费用

1. The pump exhaust should lead to the open air or a fume hood.
   抽气泵的排气管应该导向室外空旷处或导向一座通风橱。