雨影区，是指山脉的背风面降雨量较少的地区。因盛行风向变化不大，潮湿气流受高山阻挡，被迫抬升致雨降落于迎风面，使气流中水汽大大减少，翻山后下沉增温，造成背风面地区少雨。
大草原坐落在落基山脉的东部雨影区，其上河流几乎全部发源自落基。
The prairieslie in the eastern rain shadow of the Rocky Mountains. Almost all theirrivers flow eastward from the Rockies.
印度北部Leh的高纬度的沙漠进入了喜马拉雅上的雨影区，像撒哈拉沙漠一样有一点仓促。
The high-altitude desert of Leh in northern India falls in the rain shadow of the Himalayas, receiving as little precipitation as the Sahara.
此外，风，水分蒸发和雨影区也会导致湿度的转移。不过，我保持了这个算法的简洁。
Also, wind, evaporation, and rain shadows might be useful for transporting moisture as humidity.
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