前面放不定冠词an的字母及名词知多少

※ 前面放不定冠词an 名词知多少 an a,e,i,o,l,m,n,h,s,8,apple,orange,egg,onion eraser elephant,ant English,old,empty,active hour,umbrella,e-mail,office,art room eye,ear,arm uncle,aunt actor,actress,engi...