[i:]字母组合:ee ea e ie ei

three tree green sheep meet beef see seek

he she me

piece receive ceiling

it big six sixty city sit picture is list mix fix fit pig build miss

myth many twenty happy dictionary

defect decide delicious

i:] sea, he, see, piece, meat2) [i] sit, build, miss, myth, swim 3) [e] bed, desk, head, red, let 4) [æ] bad, land, bank, stamp, lamp5) [a:] car, fast, class, calm, glass