Culdoscope
[医]陷凹镜, 后穹窿镜
🗣️ 情景例句
How's it going?
近况如何？
The basketball player is renowned for his fast breaks.
这名篮球运动员以快著称。
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。