balance of moving part

例句：

1. 1.The scales are balanced on the scales.
   天平上的秤砣平衡了。
2. 2.The two sides need to find a balance between their interests.
   双方需要找到他们利益的平衡点。
3. 3. The teacher tried to balance the class by assigning different tasks to 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。