<正>1.学而时习之,不亦说乎?有朋自远方来,不亦乐乎?人不知而不愠,不亦君子乎?Isn’t it a pleasure to learn and constantly practice what is learnt?Isn’t it delightful to have friends coming from afar?Isn’t he a gentleman who is not annoyed for not being understood?
科研之友
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