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51. | built-in obsolescence |
| 内在陈旧性 |
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52. | purpose-built home |
| 特建院舍 |
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53. | built in lighting |
| 内装照明 |
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54. | built-in system |
| 内部系统 |
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55. | built-in cavity |
| 管内空腔共振器 |
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56. | built-in mounting |
| 固有支座 |
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57. | built-in furniture |
| 镶壁家具 |
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58. | built-in sluice |
| 内装闸门 |
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59. | built-in galvanometer |
| 内装式检流计 |
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60. | built-up member |
| 装配部件 |
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