煤气管道已被关闭,以防漏气.The gas pipe has been blocked off to prevent escapes.这会造成漏气，破坏罐子的密封性。This would permit air to enter, breaking the hermetic seal of the jar.如果煤气管漏气, 你必须关闭送气管, 因为那很危险.If the gas blows back , you must turn off...
Democrats have been worried about being cast as the party of the poor...民主党人一直担心被描绘成穷人的政党。I was worried she would walk out or bring the interview to an end...我担心她会离场或者终止采访。I hate that they should be worried [ them to be ...