气压梯度与天气图上等压线的间隔大小成反比。
The atmosphere pressure gradient is an inverse measure of the spacing of the isobars on a weather map.
具有大致同心的等压线的低压区在技术上称为气旋。
A region of low pressure with roughly concentric isobars is known technically as a cyclone.
自由水面线、等水头线以及等压线的分布情况都是合理的，具有良好的规律性。
The distribution of the seepage lines and isopotential line (isobaric lines) is reason-able and regular.
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