balance quantity

例句：

1. 1. The scales are balanced on the scales.
   秤上的砝码是平衡的。
2. 2. The company needs to balance its profits with investments in research and development.
   公司需要平衡其利润与研发投资。
3. 3.The teacher balanced the class by asking questions that were easy for everyone to answer.
   老师通过提出每个人都能回答的问题来平衡课堂。