a swimming boy: 现在分词 (who is swimming。 所以是现在分词。)
a swimming pool: 动名词 (可以变成used for+ swimming,所以是动名词。)
a swimming boy: 现在分词 (who is swimming。 所以是现在分词。)
a swimming pool: 动名词 (可以变成used for+ swimming,所以是动名词。)
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