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.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句