蟪蛄不知春秋 [ㄏㄨㄟˋ ㄍㄨ ㄅㄨˋ ㄓ ㄔㄨㄣ ㄑㄧㄡ; hui4 gu1 bu4 zhi1 chun1 qiu1] lit. short-lived cicada does not know the seasons; fig. to see only a small piece of the big picture ◄ ►