base o ervation timebase observation timeprincipal of observation time基本: basic; fundamental觀察時(shí)間: observing time; viewing time觀察時(shí)間: hour of observation; observation time; observing time; viewing duration; viewing time觀察時(shí)間差: observed time difference觀察時(shí)間差測(cè)量: otd下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯
