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| 41. | break one's head |
| 碰破头 |
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| 42. | heat transfer head |
| 传热头 |
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| 43. | ball joint head |
| 球形头 |
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| 44. | not having a head or formed without a head. |
| 没有头或者形成时就没有头。 |
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| 45. | polished rod head |
| 光杆头 |
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| 46. | axle journal head |
| 轴颈头 |
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| 47. | hexagon socket head |
| 内六角头 |
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| 48. | molding of fetal head |
| 胎头变形;胎头可塑性 |
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| 49. | fractional still head |
| 分馏头 |
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| 50. | Fire extinguisher actuator head. Single head with connectors. |
| 灭火器激励器头。有连接器的单头。 |
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