Fog is near the ground. 雾靠近地面。

　　And it is colorless. 它是无色的。

　　Also, fog has lots of water. 雾中含有大量水分。

　　How does fog form? 那么，雾是如何形成的呢？

　　If warm air meets cold air, fog forms. 冷空气与暖空气交汇时，雾就形成了。

　　Fog forms when temperature and dew point are different. 温度与露点不同时也会产生雾。

　　The foggiest place on land is Point Reyes, California. 陆地上雾气最重的地方是加利福尼亚的雷斯岬。

　　There are more than two hundred foggy days every year there.  那里一年有两百多天是雾天。