常衡

例句：

1. 1. The weight of the object is balanced by its own gravity.
   物体的重量由其自身的重力平衡。
2. 2. The two teams are evenly matched, making it a close match.
   两队实力相当，比赛很激烈。
3. 3. The teacher adjusted the scales to ensure fairness in the test.
   老师调整了天平以确保考试的公平性。