old balance

例句：

1. 1. The old man balanced his books on his head.
   老人把书放在头上保持平衡。
2. 2. The teacher asked the students to balance their books on their desks.
   老师要求学生们把书本放在桌上保持平衡。
3. 3. The old woman balanced her cane on her hip as she walked.
   老妇人走路时用拐杖保持平衡。