未必

not necessarily / maybe not

not yet / did not / have not / not / 8th earthly branch: 1-3 p.m., 6th solar month (7th July-6th August), year of the Sheep / ancient Chinese compass point: 210°

certainly / must / will / necessarily

being bright at an early age does not necessarily bring success upon growing up (proverb)

wind does not come from an empty cave without reason / there's no smoke without fire (idiom)

not necessarily / that's not sure