蟪蛄不知春秋

huì gū bù zhī chūn qiū

lit. short-lived cicada does not know the seasons; fig. to see only a small piece of the big picture

huì

(cicada)

see 螻蛄|蝼蛄[lou2 gu1]

no; not so

zhī

to know

chūn

spring (season)

qiū

used in 鞦韆|秋千[qiu1 qian1]