weightlessly       
adverb uk/ˈweɪt.ləs.li/ us/ˈweɪt.ləs.li/
 无重地;失重地
in a weightless way (= having or appearing to have no weight)
  Floating weightlessly in a blue, blue world, we dive deeper. 轻盈漂浮在一个蓝蓝的世界中,我们潜得更深。 
 She's petite, delicate, almost weightlessly graceful. 她娇小玲珑,优雅得近乎无重量。 
 See: weightless
 - More examples
 - For 20 minutes we floated weightlessly over the vast shimmering city.
 - The space station crew bobbed weightlessly in front of a camera.
 - Cellphones fit easily into pockets and clip almost weightlessly onto belts.