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61. | alternating return trap |
| 反复回水弯 |
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62. | time after time |
| 多次|反复|不断地 |
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63. | ternately reversal load |
| 交替反复荷载 |
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64. | after repeated explanations |
| 经过反复解释 |
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65. | step-and-repeat operation |
| 逐步反复操作 |
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66. | alternating bending test |
| 反复弯曲实验 |
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67. | sing the song to death |
| 反复唱得烦死人 |
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68. | cycle of stress reversal |
| 反复应力周期 |
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69. | alternate stress test |
| 反复应力试验 |
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70. | history of repeated attack |
| 反复发作史 |
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