at-7 meaning in English
双三氯酚
Examples
- Recent brightness estimates had comet mcnaught brighter than magnitude - 5 ( minus five ) over this past weekend , making it the brightest comet since comet ikeya - seki in 1965 , which was recorded at - 7 ( minus seven )
最新的亮度估计显示出在上个周末，麦克诺特彗星的亮度已经比- 5星等还亮，这是自1965年池谷-关彗星(记录上的亮度是- 7星等)以来最明亮的一颗彗星。