Half an hour =什么?

Half an hour =什么? half hour =half an hour half hour half an hour 的意思有和区别? half an hour? 什么意思? half an hour 和a half hour有什么区别? after half an hour什么意思? half an hour ago 什么意思? half an hour=?（两个单词） a half hour还是half an hour? 是half hour还是half an hour? half an hour or a half hour? half an hour later half an hour造句 Half an hour. One and a half an hour 和An hour and a half 有什么不同 he spent half an hour swim.=It( )( )half an hour( )( ). an hour and half还是an hour and a half Sam ( )here half an hour ago括号中应填什么?为什么? 对half an hour划线提问用什么急!