词性不同。rain是名词和动词, rainy是形容词。如: it rains(动词) a lot at this time of the year.There is plenty of rain(名词) at this time of the year. It is quite rainy(形容词) at this time of the year.三句话意思相同,都表示这个时候雨量充沛。但词性不同,用法就不同。
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