Where frontal rain develops, skies are typically grey and mostly covered by clouds.

在锋面雨形成的地方，天空通常是灰色的，大部分被云所覆盖。

These are known as relief rain, frontal rain, and convectional rain.

这些雨被称为地形雨、锋面雨和对流雨。

Frontal rain develops when two bodies of air, an area of warm air and an area of cool air, meet.

锋面雨是由两股气流形成的，暖空气区和冷空气区相遇。