Erections
n. 建立( erection的复数形式 ); 建造; 竖立; 安装
🗣️ 情景例句
OK. Finish off by jogging in place.
好 ，结束之前在原地慢跑。
The typewriter is out of order.
这打字机出毛病了。
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。