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博而不精

ér jīng extensive but not refined (idiom); to know something about everything / jack-of-all-trades, master of none
(bound form) abundant; plentiful; extensive; wide / to win; to gain / to play; to gamble / learned; well-read / (bound form) doctoral degree (abbr. for 博士) / (bound form) blog (abbr. for 博客)
old variant of
  ér and / as well as / and so / but (not) / yet (not) / (indicates causal relation) / (indicates change of state) / (indicates contrast)
   no; not so / (bound form) not; un-
    jīng essence / extract / vitality / energy / semen / sperm / mythical goblin spirit / highly perfected / elite / the pick of sth / proficient (refined ability) / extremely (fine) / selected rice (archaic)
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By MDBG 2025