average annual precipitation

例句：

1. 1.The region experiences an average annual precipitation of about 20 inches.
   该地区的年平均降水量约为20英寸。
2. 2.The city's average annual precipitation is around 30 inches.
   该市的年平均降水量约为30英寸。
3. 3.The region has a high risk of flooding due to its low average annual precipitation.
   由于年平均降水量低，该地区面临洪水风险高。