linear

温度和时间呈现出明显的线性关系。

Temperature and time show a strong ___linear relationship.

我们需要一根线性尺子来测量这条直线的长度。

We need a ___linear ruler to measure the length of this straight line.

这条道路采用了线性的设计，一直延伸到山脚下。

The road follows a ___linear design, stretching straight to the foot of the mountain.