Ucsf
abbr. University of California; San Francisco <美>旧金山加利福尼亚大学
🗣️ 情景例句
Did you look at them?
你看过了吗？
Not at all. Go ahead.
好，请吧。
So the number of stars that we know exist is now estimated at about 300 million million million.
因此，我们所知道的现有恒星数目估计约有30亿×1000亿颗。