平衡物

例句：

1. 1.The scales on the scales are perfectly balanced.
   秤上的秤砣完全平衡了。
2. 2. The two teams are neck and neck in the competition.
   两队在比赛中势均力敌。
3. 3.The teacher asked us to balance our books on one leg.
   老师让我们用一只脚支着书本。