put an old head on young shoulders

例句：

1. 1. He put his hand on the table to steady himself.
   他把手放在桌子上稳住自己。
2. 2. The teacher put the textbooks on the desk.
   老师把教科书放在桌子上。
3. 3. She put her hand in her pocket and took out a piece of paper.
   她把手伸进口袋里拿出一张纸。