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51. | timing uncertainty |
| 计时不准 |
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52. | isotopic chronometry |
| 同位素计时 |
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53. | timing selector |
| 计时选择器 |
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54. | timing equipment |
| 计时设备 |
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55. | internal clocking |
| 内部计时 |
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56. | timing track circuit |
| 计时轨道电路 |
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57. | anticipatory timing |
| 预期计时 |
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58. | timer interruption |
| 计时中断 |
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59. | timing operations centre |
| 计时中心 |
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60. | Short -Term Card |
| 计时票 |
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