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| 31. | cylindrical opening |
| 圆筒形开口 |
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| 32. | Half Opening |
| 半开口 |
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| 33. | open tubular column |
| 开口管柱 |
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| 34. | tapered opening |
| 锥形开口 |
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| 35. | open-end agreement |
| 开口协定 |
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| 36. | permanent opening |
| 固定开口 |
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| 37. | open-tubular capillary column |
| 开口毛细管柱 |
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| 38. | diagonal cut joint |
| 斜开口 |
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| 39. | gap-clearance of piston rings |
| 活塞环开口 |
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| 40. | But she was afraid to speak. |
| 可是她不敢开口。 |
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