Quadric
a. 二次的\\nn. 二次曲面
🗣️ 情景例句
you'll really publish Family Album, U.S.A.?
你真的会出版 美国写真集 啦？
It is easy to be wise after the event.
当事后诸葛亮容易。
He did not know from which part of Africa his ancestor had come.
他不知道祖先来自非洲的什么地方。