以上来源于: WordNet
N-COUNT A count noun is a noun such as "bird," "chair," or "year" which has a singular and a plural form and is always used after a determiner in the singular. 可数名词
Many English-speakers over time thought this was a plural count noun, though, and so pea is a back-formation.
不过，随着时间的推移，许多以英语为母语的人认为它是可数名词的复数形式，于是就有了逆成词pea。
youdao
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