weightless [ˈwetlɪs]

例句:

• Astronauts work in weightless conditions.
  宇航员在失重的条件下工作。
  
• Photons have no mass—they are weightless.
  光子没有质量——它们是无重的。
  
• Helen described life in a weightless environment during her period in space.
  海伦描述了她身处太空时失重状态下的生活。
  
• Oh... wait... in those little nearly weightless diodes?
  来自SA
• One becomes timeless, weightless & massless.
  来自SA
• "I feel very light, almost weightless," he pronounced.
  来自NEWYORKER