Quadric
a. 二次的\\nn. 二次曲面
🗣️ 情景例句
He reads the headlines, news sections, amusemenu section, sports pages, editorials, and the business section.
他读头条、新闻版、娱乐版、体育版、社会和经济版。
A bad custom is like a good cake, better broken than kept.
坏习惯像鲜馅饼，分食要比保存好。
It took him some time to connect the long rubber pipe to the air supply pipe that ran round the port, but at last it was done and as a result work was able to progress much faster.
他花了不少时间把长长的橡胶管接到铺设在码头周围的空气供应管上，最后他终于把它们连接起来，工作因而进展得更快。