漫游猫认证
用不定冠词an,例如:
1.He didn't even have the intelligence to call for an ambulance.他连呼叫救护车的头脑都没有。
3.Someone phone for an ambulance!谁打电话叫辆救护车!
漫游猫会员
发音是原因音标开头的用不定冠词an,泛指用an特指就用定冠词the
ambulance 前面用不定冠词an