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51. | mid-span moment |
| 跨中弯矩;跨中力矩 |
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52. | An overpass bridged the highway. |
| 立交桥跨越高速公路。 |
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53. | valley-span antenna |
| 山谷天线 |
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54. | multiple span bridge |
| 多孔桥 |
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55. | infinite span wing |
| 无限翼展机翼 |
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56. | Memory Span Test |
| 记忆广度测验 |
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57. | depth-span ratio |
| 高跨比 |
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58. | multiple beam span |
| 多梁桥跨 |
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59. | memory span method |
| 记忆广度法 |
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60. | life span development |
| 毕生发展 |
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