Quadric
a. 二次的\\nn. 二次曲面
🗣️ 情景例句
Without coffee I could never get up in the morning.
不喝咖啡我早上起不来。
Not at all.
没什么。
Mr Hu stood at the starting line. All the runners got ready to run.
胡先生站在起跑线上。所有的运动员都做好了起跑准备。