gravity
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n.[U]
1.【物】重力;引力;地心吸力
The stone rolled down the hill by gravity.
石头在重力作用下向山下滚去.
2.重(量)
3.严重性;危险性;重大
She does not know the gravity of her illness.
她不知道自己病情严重.
4.严肃;庄严;认真
He could hardly keep his gravity.
他忍不住要笑出来.
5.低沉