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opportunity knocks but once opportunity only knocks once quote opportunity comes but once opportunity doesn't knock it presents itself if opportunity doesn't knock opportunity seldom knocks twice opportunities knock at the door but once knock at 和knock on区别 

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opportunitities翻译 opportunity favors only the prepared mind翻译 opportunity英语翻译 opportunists and competitors译文 opportunities where you are翻译 an opportunity came along翻译 knock knock trick or treat翻译 not poor,just broke翻译 opportunities的翻译 opportunity翻译中文 

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