| 单词 | time standard |
| 释义 | time standard [`tīm ´stan·dǝrd] HOROLOGY A recurring phenomenon, used as a reference for establishing a unit of time; the presently accepted standard is the second, defined to be 9,192,631,770 transitions between two specified hyperfine levels of the atom of cesium-133. INDUSTRIAL ENGINEERING See <<standard time>> |
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