an eraser 还是 a eraser

an eraser 还是 a eraser 一块橡皮翻译是a eraser还是an eraser a eraser（橡皮）还是an eraser?为什么? 橡皮的单数是a eraser还是an eraser eraser前加a还是an? black eraser前加an 还是a eraser前面是加a还是an She n_ a pencil and an eraser. This is eraser,eraser is inThis is eraser,eraser is in the pencil box.A.a;The B.an;The C.an;An D.the;The(对了,) Erase It`s an eraser.为什么加an不加a Is that an eraser?( ),it's a dictionary此处填NO还是NO IT ISN’T? It's an eraser.中文怎么翻译? E-R-A-S-E-R,eraser.怎么翻译? 发元音的单词前面加了形容词后该用a还是an.比如yellow eraser,如果按照eraser该加an,按yellow该加a,到底该加什么呢? 英语面临一个翻译时比如翻译：一块橡皮 an eraser 一本书 a book 怎么识别加a还是加an呢? Chen Jie has a schoolbag,but she _____ an eraser. A pencil costs twice as much as an eraser(急!) an eraser 怎么读