half hour =half an hour

half hour =half an hour Half an hour =什么? 是half hour还是half an hour? half an hour or a half hour? a half hour还是half an hour? half an hour later half an hour? half an hour=?（两个单词） half an hour or hour中文 an hour and half还是an hour and a half half an hour? 什么意思? it's half an hour