真空

• The vacant place is taken by one of the outer electrons which thus leaps from an outer to an inner "shell" .
  真空穴由一个从外“壳”跃至内“壳”的外层电子来填充。
• The ignition-distributor vacuum-advance mechanism advances the spark during part-throttle operation .
  分电器点火真空提前装置在节气门部分开启期间，使火花提前发出。
• Our choice in 1972 was to help iran arm itself or to permit a perilous vacuum .
  1972年我们面临的抉择是：要么帮助伊朗自己武装起来，要么就得容忍一种危险的真空状态。
• The piston moves up and down in the piston chamber primarily in response to changes in intake manifold vacuum .
  活塞主要因进气歧管真空度的变化而在活塞腔内上下移动。
• The statement should be qualified and should specify that all bodies fall at the same rate in a vacuum .
  这个论述应加以限定，并修正如下：所有物体在真空中以相同速度降落。