单词	spark gap
释义	spark gap noun : a space between two high-potential terminals (as of an induction coil or spark plug) through which pass discharges of electricity also : a device having a spark gap Word History First Known Use 1889, in the meaning defined above
随便看	have nothing on someone have nothing to recommend her have nothing to recommend him have nothing to recommend it have on have on a string have one foot in the grave have one pair of hands have one's bases covered have one's bell rung have one's cake and eat it have one's cake and eat it too have one's day in court have one's ducks in a row have one's eye on have one's eye out for have one's feet cut out from under have one's feet cut out from under one have one's feet on the ground have one's finger on the pulse of have one's guard up have one's hands full have one's hands in the till have one's head examined have one's head on right

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