| 单词 | caesium clocks |
| 释义 | caesium or (N American) cesium /sēˈzi-əm/nounA silver-white soft alkaline metallic element (symbol Cs; atomic no 55) used in the form of compounds or alloys in photoelectric cells, etc ORIGIN: Ety as for caesious caesium clock noun An atomic clock regulated by the natural resonance frequency of excited caesium atoms |
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