ㄍㄨㄢˇㄓㄨㄥㄎㄨㄟㄅㄠˋguǎnzhōng‑kuībào

管中窥豹
  1. 透過竹管只能斑點比喻狹小全貌 管中窺豹整個事件結論只怕客觀」。

lit. to see a leopard through a narrow tube (idiom)​; fig. to miss the big picture