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| 31. | mild steel shell |
| 低碳钢外壳 |
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| 32. | The outer casing of a rocket, guided missile, or spaceship. |
| 外壳火箭，导弹或宇宙飞船的外壳 |
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| 33. | taxicab exteriors |
| 出租车外壳 |
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| 34. | quartz contactor |
| 石英外壳 |
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| 35. | A shell casing. |
| 贝壳外壳 |
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| 36. | moisture proof case |
| 防潮外壳 |
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| 37. | drawn-shell case |
| 压制外壳 |
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| 38. | microphone case |
| 传声器外壳 |
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| 39. | metal ceramic package |
| 金属陶瓷外壳 |
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| 40. | pressure tight case |
| 气密外壳 |
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