“主钟”（primary clock）是天文学专有名词。来自中国天文学名词审定委员会审定发布的天文学专有名词中文译名，词条译名和中英文解释数据版权由天文学名词委所有。
n. master clock
misc. primary clock
... 原级铯射束频率标准 primary cesium beam frequency standard 主钟；原级钟 primary clock 初级线圈 primary coil ...
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哺乳动物中的昼夜节律系统由位于下丘脑scn核内的生物钟主钟和位于多数外周细胞中的子钟组成。
The circadian system in mammals is composed of a master pacemaker in the suprachiasmatic nucleus (SCN) of the hypothalamus and slave clocks in most peripheral cell types.
在全世界的注视下，现场的500名消防员奋力阻止大火蔓延到两座悬挂着大教堂钟的主塔。
While the world looked on, the 500 firefighters at the scene then battled to prevent the flames from reaching the two main towers, where the cathedral bells hang.
45分钟主回路的水位继续下降。
45 min the water level in the primary loop continues to drop.
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