“直线的”的英语可以翻译为：linear，rectilineal，straight，sharp ...

欧几里得不自觉地假定了直线的无限性.Where Euclid unconsciously assumed the infinitude of straight lines.对输入信号的响应偏离直线的程度.Deviation from a straight - line response to an input signal.通过这两直线的交点做横轴的垂线.Draw a line perpendicular to the horizont...