7.坐标
coordinate system 坐标系 rectangular coordinate 直角坐标系 origin 原点 abscissa 横坐标 ordinate 纵坐标 number line 数轴 quadrant 象限 slope 斜率complex plane 复平面
Pollution
My Hobbies
写给母亲的感谢信
体坛英语资讯：Chinese star footballer Wu Lei tests positive for COVID-19 in Spain
国内英语资讯:Critically endangered wild Chinese pangolins spotted in east China
国际英语资讯:Turkey confirms 1,546 new COVID-19 cases, 137,115 in total
国内英语资讯:35 central Party, state institutions targeted in new round of disciplinary inspections
5G网络将助力实现车与车“对话” 减少道路交通事故
国际英语资讯:Commentary: Deadly pandemic exposes deficits in responsibility, morality in Washington
国内英语资讯:Chinas major grain-producing province launches germplasm pool