Quadric
a. 二次的\\nn. 二次曲面
🗣️ 情景例句
It's asking a lot.
那需要做许多工作。
From the mountain, Lenny can look off across the valley.
雷尼可以从那座山眺望谷间远处的那边。
The bison skins were sent by rail to cities to be sold.
野牛皮用火车运到城里出售。