| 单词 | unit distance |
| 释义 | unit distanceunit distanceThe astronomical unit of length, i.e. the length for which the Gaussian gravitational constant takes its exact value when the units of measurement are the astronomical units of length, mass, and time. It is equal to the speed of light, c , times the light-time for unit distance, τA, i.e. to 1.495 978 70 × 1011 meters. |
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