词典释义：
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You're very sure of yourself, aren't you? With good reason.
你很自信，不是吗？我有充分的理由。
《Sherlock Season 4》《神探夏洛克 第四季》
双语例句
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Sumner Redstone : You cannot be sure of yourself.
萨姆纳·列思多: 你是没办法了解自己的.
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Make sure you are absolutely sure of yourself with this one! May I? This is a very formal but very useful phrase to use in expressing your opinion.
一定要确定你对这个绝对有把握！我可以吗？这是一个非常正式但非常有用的短语来表达你的意见。