释义 |
cesiumce‧si‧um /ˈsiːziəm/ noun [uncountable]  - 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 |