蟪蛄不知春秋

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

CEDICT

蟪蛄夏生秋死，所以不知春秋。比喻生命短促或见识短浅。

重編國語辭典

Entry Composition

1 蟪蛄 huìgū Platypleura kaempferi, a kind of cicada
2 不知 bùzhī
  1. not to know
  2. unaware
  3. unknowingly
  4. fig. not to admit (defeat, hardships, tiredness etc)
3 春秋 chūnqiū
  1. spring and autumn
  2. four seasons
  3. year
  4. a person's age
  5. annals (used in book titles)