weightless
adj. 失重的；无重量的
例句
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。
《柯林斯英汉双解大词典》
Photons have no mass – they are weightless.
光子没有质量——它们是没有重量的。
Living things seem to be staying within the wave, moving slowly inside it as if they were weightless.
生物似乎停留在波浪中，它们好像没有重量，在波浪中缓慢移动。
