保持平衡物

例句：

1. 1.The scales on the scales are balanced.
   秤上的秤砣是平衡的。
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 tried to balance the class by assigning different tasks for each student.
   老师试图通过分配不同的任务给每个学生来平衡班级。