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21. | anticipatory timing |
| 预期计时 |
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22. | chronograph mechanism |
| 计时机构 |
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23. | Time switch |
| 计时开关 |
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24. | timing track circuit |
| 计时轨道电路 |
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25. | calendar scheduling |
| 计时等 |
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26. | internal clocking |
| 内部计时 |
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27. | isotopic chronometry |
| 同位素计时 |
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28. | timing operations centre |
| 计时中心 |
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29. | timing selector |
| 计时选择器 |
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30. | timing uncertainty |
| 计时不准 |
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