Quadric
a. 二次的\\nn. 二次曲面
🗣️ 情景例句
Do you want to do something this Sunday? John and I would like you to come over for a party.
你星期日要不要做什么事？约翰和我想请你过来参加宴会。
You say it, but you don't mean it.
口是心非。
He owned himself defeated.
他承认自己失败了。