weightlessness 

英汉解释

n. 失重；无重状态

同义词

n. lightness

反义词

n.   heaviness，weightiness

参考例句

1. Yes, but weightlessness and zero gravity are two different things.
是的，但失重和零重力是两件不同的事。
2. Some of these problems, similar to those of living in outer space, are pressure, Lack of oxygen and weightlessness.
其中有些问题，与在外层空间生活时所遇到的一样，是压力。缺氧和失重现象。
3. Objective To study changes in electrophysiological characteristics of muscle spindles induced by simulated weightlessness in isolated rats soleus.
目的观察模拟失重不同时期大鼠离体比目鱼肌肌梭电生理特性的改变。

英英解释

n.
  1. the property of being comparatively small in weight

网络释义

weightlessness
失重; 无重状态，失重; 无重状态; 无重力;
experience weightlessness
体验无重力的经验;
Wt weightlessness
失重;
simulated weightlessness
释义：模拟失重;
Physiological effect of weightlessness
英文 失重生理效应;