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...
The hands are richly supplied with nerve endings.手上布满了神经末梢。It often happens that little beginnings have great endings.微不足道的开端往往会有伟大的结果.Note the endings of these regular past tense verbs.注意过去时态动词的结尾....
具有大致同心的等压线的低压区在技术上称为气旋.A region of low pressure with roughly concentric isobars is known technically as a cyclone.他的飞机飞进低压区开始结冰.His plane flew through a low pressure area and began to ice up....