名詞 rainfall:

1. water falling in drops from vapor condensed in the atmosphere
   同義詞：rain

1. Excessive rainfall had made the harvest impossible.
   雨量過(guò)多，豐收已經(jīng)不可能了。
2. The mean yearly rainfall is20 inches.
   每年平均降雨量是二十英寸。
3. The lateral or downward movement of dissolved or suspended material within soil when rainfall exceeds evaporation.
   淋溶作用當(dāng)降雨量超過(guò)蒸發(fā)量時(shí)，土壤中溶解或懸浮物的向側(cè)面或向下的運(yùn)動(dòng)
4. The rainfall averages 36 inches a year.
   年降雨量平均為36英寸。
5. This area has very low rainfall.
   這個(gè)地區(qū)雨量稀少。

rain.fall

n.（名詞）
A shower or fall of rain.
陣雨，降雨
The quantity of water, expressed in inches, precipitated as rain, snow, hail, or sleet in a specified area and time interval.
降雨量：雨的數(shù)量以英寸表示，為某一地區(qū)在特定時(shí)間段內(nèi)雨、雪、冰雹或霰的積累量