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51. | en echelon structure |
| 雁列状构造;雁行式构造 |
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52. | en echelon fold |
| 雁形褶皱 |
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53. | en echelon folds |
| 雁列褶皱 |
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54. | en-loop bandwidth |
| 开环带宽 |
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55. | en echelon joint |
| 雁列节理 |
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56. | damas en dorure |
| 金花丝锦缎 |
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57. | en echelon lenses |
| 雁行透镜体 |
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58. | en operating lock |
| 舱盖打开时的锁挡 |
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59. | EN tandem accelerator |
| EN串列式加速器 |
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60. | en-loop response |
| 开环响应 |
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