🗣️ 情景例句
Grandpa, when did Dad graduate from Michigan?
爷爷，爸爸是什么时候从Michigan毕业的？
Have a nice day.
祝您好。
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。