| 21. | a bolt shaking loose in an engine |
| 发动机上震松的螺栓
|
| 22. | sit bolt upright |
| 挺直地坐着
|
| 23. | open, shut, close, lock, bolt the door |
| 开, 关, 闭, 锁, 栓门
|
| 24. | do a bolt |
| （俚）逃去
|
| 25. | shoot one's (last) bolt |
| 竭尽全力，智穷才尽
|
| 26. | a thunder bolt |
| 雷电，霹雳
|
| 27. | as straight as a bolt |
| 其直知矢
|
| 28. | a bolt from [out of] the blue |
| 晴天霹雳；大出意外的事；飞来横祸
|
| 29. | an anchor [a foundation] bolt |
| 地脚螺栓
|
| 30. | a binder [connecting] bolt |
| 连接螺栓
|