单词	cesium
释义	cesiumce‧si‧um /ˈsiːziəm/ noun [uncountable] Examples EXAMPLES FROM THE CORPUS During irradiation, food is exposed to gamma rays from sources such as cobalt 60 or cesium 137. The definition of a second has since officially been the time it takes a cesium atom to make 9,192,631,770 vibrations. the American spelling of caesium
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