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I can affirm that he is tenacious and pertinacious as are few.我可以肯定,像他那樣不屈不撓、百折不回的人是十分罕見(jiàn)的.Questions buzzed in his head like pertinacious bees.一連串問(wèn)題在他腦子里盤(pán)旋著,就象糾纏不休的蜜蜂.The ideas of my friend Watson, though limited are exce...