我该如何区分?
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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）一个半小时可以说：one hour and a half或者one and a half hours
我该如何区分?
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）一个半小时可以说：one hour and a half或者one and a half hours