It is said that one　　（three） of the water around the world is polluted.

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Three Class, One Grade Class Three, Grade One Grade One, Class Three class three, grade one

enum a=one, two, three)； enum a one=9, two=1three； enum a="one", "two", "three"; enum a "one", "two". "three";

enum a={one,two,three}； enum a{one=9,two=-1,three}')； enum a={"one"two"three"}； enum a{"one"two"three"}；

enum a=one,two,three; enum a one=9,two=1,three; enum a="one","two","three"; enum a"one","two","three";

twenty-one twenty-three twenty-one hundred twenty-three two thousand and one hundred，twenty-three two thousand，one hundred and twenty-three

one in two or three minutes one after two or three minutes after two or three minutes one for two or three minutes

three times larger than three times as large as three times the size of as three times large as

enum a={one,two,three}; enum a{on=9,two=-1,three}; enum a={"one","two","three"}; enum a{"one","two","three"};

nine two seven ,three one three one, nine two seven nine two three, seven one three one, nine seven two

the one of three years ago one three years ago the one since three years one from three years