用anMTRstation造句(the MTR station 或 an MTR station 以上那一句子是正)

用anMTRstation造句(the MTR station 或 an MTR station 以上那一句子是正)

为什要用(an)MTR,station,而不用(a)MTR,station,呢?在元音前用an,在非元音音素前用a.在以元音开始发音的单词前用a......