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| 71. | air tight joint |
| 气密接头 |
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| 72. | a tight knot. |
| 系得很紧的结 |
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| 73. | A tight spot. |
| 困境 |
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| 74. | pressure-tight connection |
| 耐压密闭连接 |
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| 75. | germ tight filter |
| 除菌滤器 |
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| 76. | air tight construction |
| 气密构造 |
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| 77. | Cling on tight! |
| 抓紧! |
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| 78. | pressure tight joint |
| 耐压接缝 |
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| 79. | air tight chamber |
| 气密室 |
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| 80. | Hermetically tight seal |
| 气密密封 |
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