I cheered up immediately and floated weightlessly around in our spaceship cabin.

我立刻欢呼起来，身体失重在宇宙飞船中到处飘来飘去。

Throughout its growth, the fetus is well protected from injuries as it floats almost weightlessly inside a fluid filled sac called the amniotic sac. 在胎儿整个生长发育期间，他/她漂浮在羊水里而得到了很好的保护。