Universal time service in the years 1966-1975 is reviewed, including astronomi- cal time observations, the Joint System of universal time, the rapid service and the controling of the transmission of UT_1 time signals.是什么意思_Universal time service in the years 1966-1975 is reviewed, including astronomi- cal time observations, the Joint System of universal time, the rapid service and the controling of the transmission of UT_1 time signals.在线翻译_英语_读音_用法_例句