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| 41. | a factory whistle. |
| 厂笛 |
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| 42. | sound a whistle |
| 鸣汽笛，吹哨 |
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| 43. | a sharp whistle. |
| 刺耳的笛声 |
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| 44. | whistle lever rod |
| 汽笛拉把杆 |
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| 45. | brass whistle valve |
| 铜笛阀 |
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| 46. | a shrill whistle |
| 尖锐的汽笛声 |
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| 47. | a steam whistle |
| 汽笛 |
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| 48. | the blackbird's whistle |
| 黑鹂的鸣叫声. |
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| 49. | wet one's whistle |
| [美]喝酒润喉 |
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| 50. | visible air whistle |
| 蒸汽汽笛 |
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