| 单词 | cesium |
| 释义 | cesium (once / 117023 pages) n WORD FAMILY cesium USAGE EXAMPLESMore constant than the earth’s rotation are atomic clocks, which measure the regular and super-precise vibration of cesium atoms. Time(Dec 30, 2016) In effect, the meter is defined to be the distance traveled by light in 0.000000003335640952 second, as measured by a cesium clock. Stephen Hawking, A Brief History of Time: And Other...(1988) That radioactive isotope is, along with cesium-137, commonly produced during nuclear fission and generates most of the heat and penetrating radiation from nuclear waste. Washington Times(Apr 25, 2016) n a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal Syn|Hypo|Hyper Cs, atomic number 55, caesium cesium 137 a radioactive isotope of cesium used in radiation therapy metal, metallic element any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. |
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