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I didn't mean to tell you his name; it was a slip of my tongue at that time.
我不想把他的名字告诉你, 只是一时失口而已.
《现代汉英综合大词典》
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Once as it happened, the Professor forgot so far as to mention accessible things.
有一次, 教授偶然失口,说出一件容易得到的东西.
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