a swimming boy: 現在分詞 (who is swimming。 所以是現在分詞。)
a swimming pool: 動名詞 (可以變成used for+ swimming,所以是動名詞。)
a swimming boy: 現在分詞 (who is swimming。 所以是現在分詞。)
a swimming pool: 動名詞 (可以變成used for+ swimming,所以是動名詞。)
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