"多雨"在英语中可以用"heavy rainfall"或"heavy rain"表示。
"Heavy"是形容词，意思是"大量的、大的"，"rainfall"是名词，意思是"降雨量"，"rain"是名词，意思是"雨"。所以，"heavy rainfall"和"heavy rain"都可以表示"多雨"的意思。
例句：
The forecast says there will be heavy rainfall tonight.
(预报说今晚会有大量降雨。)
The streets were flooded because of the heavy rain.
(街道因为大雨而淹水。)