| 单词 | ammonia clock |
| 释义 | ammonia clock [ǝ`mōn·yǝ `klak] HOROLOGY A time-measuring device dependent on the pyramidal ammonia molecule's property of turning inside out readily and oscillating between the two extreme positions at the precise frequency of 2.387013 × 1010 hertz. Also known as ammonia maser clock. |
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