half an hour和a half hour一样吗?

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half an hour和a half hour一样吗?
half an hour和a half hour一样吗?

half an hour和a half hour一样吗?
它们的意思是一样的,美式英语里面多用half an hour,英式英语里面多用a half hour
半个小时的说法有:half an hour,a half hour,half of an hour(前两种用得多些)