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| 51. | stopwatch time method |
| 跑表计时法 |
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| 52. | chronograph wheel |
| 秒计时轮 |
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| 53. | pocket chronometer |
| 精密计时怀表 |
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| 54. | time kicking |
| 打腿计时 |
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| 55. | time-count cycle |
| 计时循环[周期] |
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| 56. | straight daywork |
| 直接计时制 |
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| 57. | timing current switch |
| 计时电流开关 |
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| 58. | subscription [toll] television |
| 计时收费电视 |
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| 59. | asynchronous timing |
| 异步计时法 |
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| 60. | timing electronics |
| 计时电子学设备 |
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