| 11. | It was upon this principle that the first instruments were made, but while the drum was being shaken, the line that the pen was drawing wriggled from side to side. |
| 只要一切都是静止的，笔就会划出一条直线；但是，圆筒受到震动，笔所画出的线就会就会左右摆动。
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| 12. | We heard the beat of the drum . |
| 我们听到鼓声。
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| 13. | The beats of the drum were steady and slow. |
| 鼓声平稳而缓慢。
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| 14. | He gave three taps on the drum . |
| 他击鼓三下。
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| 15. | play the drum (s) in a band |
| 在乐队中打鼓
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| 16. | drum on the table with one's fingers |
| 用手指在桌上敲出鼓点声
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| 17. | drum one's feet on the floor |
| 跺脚
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| 18. | a ten-gallon drum |
| 容量为十加仑的桶
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| 19. | rhythmic beats of a drum |
| 有节奏的击鼓声
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| 20. | drum up business |
| 招揽生意
|