rain·fall /-ˌfɔl/
  降雨,降雨量
  Rain·fall n. A fall or descent of rain; the water, or amount of water, that falls in rain; as, the average annual rainfall of a region.
     Supplied by the rainfall of the outer ranges of Sinchul and Singaleleh.   --Hooker.
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  rainfall
       n : water falling in drops from vapor condensed in the
           atmosphere [syn: rain]