linear type

例句：

1. 1. The line of the road is straight and easy to follow.
   这条路线是直的，很容易跟随。
2. 2.The data is linearly proportional to the input.
   数据与输入成正比例关系。
3. 3.The graph shows a linear relationship between the two variables.
   图表显示两个变量之间存在线性关系。