计量学编译词汇A-43-SCIdict学术词典-北... ... 天文秒 astronomical second 天文{时间}标准 astronomical standard 天文日照时间 astronomical sunshine duration ...
双语例句
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In principle, one can trace that history back in cosmic time by observing a so-called standard candle, a class of astronomical object whose intrinsic luminosity is uniform.