subsonic [ˌsʌbˈsɑ:nɪk]

例句:

• This is 20,000 feet higher than most subsonic airliners.
  这比大多数亚音速飞机的飞行高度高20,000英尺。
  
• The Variabledomain variational FEM is used to design 2 D subsonic cascades.
  本文给出了亚声速平面叶栅反命题计算的势函数变域变分有限元解法.
  
• I have no idea what subsonic speed is.
  我实在不明白什么是亚声速.
  
• There's a subsonic drum presence, rather like a hugely amplified cardboard box-thump.
  来自BBC
• If I hit a big bass track, the subsonic frequencies will attract sharks.
  来自THETIMES