Dbtg
美国数据库工作组
🗣️ 情景例句
Have a good trip.
旅途愉快。
I'm not well enough.
我还不够棒。
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。