linear direct reading thermometre

例句：

1. 1. The line of the road is straight as an arrow.
   这条路线直得像箭一样。
2. 2. The data is linearly related to the temperature.
   数据与温度呈线性关系。
3. 3. The graph is linear and easy to understand.
   这个图是线性的，容易理解。