Walla
n. 经办业务人；要人（等于wallah）
🗣️ 情景例句
You're right. Of course.
说得也是。
Here, have some coffee on me.
来，我请你喝咖啡。
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。