average monthly rainfall
月平均雨量
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Tommy: It did, but the rainfall was only half of the monthly average.
是啊，但是降水量是月平均量的一半而已。
youdao
Dorset saw rainfall amounting to more than 25% of the average monthly total in two days, with close to 30mm falling.
BBC: Dorset weather: Wind and rain causes disruption
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