| 31. | An electric switch turns the current off and on. |
| 开关机将电流切断或接通。
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| 32. | He made a quick switch from an unfriendly to a friendly manner when he saw that they could help him. |
| 当他意识到他们可以帮助他时，他的态度一下子从不友好变德友好了。
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| 33. | Parties switch him on ,but they seem to switch her off! |
| 社交聚会使他兴致勃勃，但似乎使她兴致索然。
|
| 34. | switch jobs with sb. |
| 和某人对调工作。
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| 35. | He was feeling about in the dark for the electric-light switch . |
| 他在黑暗中摸索找电灯开关。
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| 36. | Switch off lamps and mend the fuse. |
| 把灯关掉，把保险丝修一下。
|
| 37. | Turn off the switch when anything goes wrong with the machine. |
| 如果机器出故障，就把开关关掉。
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| 38. | It is his duty to switch cars from one track to another. |
| 他的职责是扳道。
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| 39. | The dog knocked a vase off the table with a switch of his tail. |
| 狗一甩尾巴 ，把桌子上的瓶子打落了 。
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| 40. | release a switch , catch, lever, etc |
| 断开开关, 松开掣子, 放松手柄
|