| 释义 |
time standard
time standard[′tīm ‚stan·dərd] (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) standard time Time Standard
Time StandardA legal or customary measure of the rate at which time passes. Most time standards are based upon the earth's rotation, that is, upon the passage of days. Nearly all modern time standards divide time into seconds, minutes and hours. |