Shāmò dìqū yì nián de jiàngshuǐliàng wǎngwǎng búdào liǎngbǎi háomǐ.
In desert regions the annual precipitation is often less than two hundred millimeters.
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usage
降水量 counts all precipitation, rain and snow together, measured in millimeters of water; 降雨量 counts rain only. Climate data usually give the 年均降水量, the average annual precipitation.
