weathering
noun [ U ] uk/ˈweð.ər.ɪŋ/ us/ˈweð.ɚ.ɪŋ/
（因日照、风霜等）褪色;变形
changes to the colour or form of something over a period of time because of the effects of sun, wind, or other weather conditions
The fence had gone from brown to a soft grey through years of weathering. 经过常年的日晒雨淋，篱笆从棕色变成了浅灰色。
geology specialized（日照、风霜等的的）侵蚀;风化;风蚀
the processes by which rock is broken into smaller pieces by the action of the weather
Weathering has seriously eroded the caves. 风化作用严重地侵蚀了岩洞。