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| 31. | system time stamp |
| 系统计时印记 |
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| 32. | A clock measures time. |
| 钟用来计时。 |
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| 33. | clock pulse source |
| 计时脉冲源 |
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| 34. | network protocol timing |
| 网络协议计时 |
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| 35. | acoustic timing machine |
| 声音计时机构 |
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| 36. | time-keeping mechanism |
| 计时机械装置 |
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| 37. | delta-T timing unit |
| 时差计时单元 |
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| 38. | International Association for Time-Keeping |
| 国际计时协会 |
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| 39. | accumulative timing |
| 积累计时法 |
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| 40. | automatic time switch |
| 自动计时开关 |
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