单词	cesium 133
释义	cesium 133 noun : an isotope of cesium used especially in atomic clocks and one of whose atomic transitions is used as a scientific time standard Example Sentences Recent Examples on the Web Since 1967, the second has been defined by the cesium 133 atom. Tim Newcomb, Popular Mechanics, 26 Apr. 2022 In the case of cesium 133, the frequency is nearly 9.2 billion ticks per second — 9,192,631,770, to be precise. New York Times, 25 Apr. 2022 Word History First Known Use 1964, in the meaning defined above
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