见微知著（見微知著）　

◎ 见微知著 jiànwēi-zhīzhù

[from one small clue one can see what is coming;from the first small beginnings one can see how things will develop] 看到微小的苗头,就知道可能会发生显著的变化。比喻小中见大

故圣人见微知著,睹始知终。——汉· 袁康《越绝书》