have wide but not expert knowledge; know something about everything ❍ 他的外号叫“百事通” 先生，但学识～。His nickname was“Mr Know-all”，and his knowledge was wide but shallow.
博而不精bó ér bù jīnɡ
学识虽然广博，但不精通。know sth. about everything, have wide but not expert knowledge
博而不精bó ér bù jīnɡ
学识虽然广博，但不精通。know sth. about everything, have wide but not expert knowledge