Conicoid
n. 二次曲面
🗣️ 情景例句
Good night, Grandpa.
晚安， 爷爷。
I suggest that you tear up the letter and start over again.
我建议你撕破信再来一遍。
Why don't you attend an aerobic class?
你为什么不去参加一个有氧健身班呢？