半个小时前英语短语怎么说
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"Half an hour ago" is how you would say "half an hour ago" in Engpsh. This phrase refers to a specific point in time that was 30 minutes before the present moment. For example, if it is currently 10:00 AM, and you want to say that something happened at 9:30 AM, you could say "It happened half an hour ago."