五个元音字母AEIOU 1：first 2 second 3：third 4 forth 现在分词： swimming
第一，二，三，四first，second，third，forth
现在分词swimming
元音字母AEIOU
first second third forth,swimming,a o e i u
第一个问题first, second, third, forth.
第二个问题swimming
第三个问题a e i o u
first,second,third,forth,fifth
swum
a,e,i,o,u
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