英譯：
the bird has flown
例句：
- Paul owed me a lot of money. When I went to his house yesterday, hoping to get my money back, the bird had flown. (保羅欠我很多錢。昨天當我去他家，希望要回我的錢時，他早已人去樓空)
- It's no use searching any more. The bird has flown. (搜索沒有用了。嫌犯已逃之夭夭)
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