n.重力；庄重；严重；严肃
He discoursed impressively on Newton's theory of gravity. 他讲述了牛顿的引力定律，给人以深刻的印象。
The stone rolled down the hill by gravity. 石头在重力作用下向山下滚去。
The lunar gravity is about one-sixth that on earth. 月亮的引力大约为地球的六分之一。
Each graduate behaved with gravity at it. 每个毕业生都举止庄重。
He doesn't seem to understand the gravity of the situation. 他似乎没有意识到形势的严重性。
She does not know the gravity of her illness. 她不知道自己病情严重。
微重力
n.微重力
n.无重量；反重力
失重
