be in someone's blood
US /bi ɪn ˈsʌm.wʌnz blʌd/
UK /bi ɪn ˈsʌm.wʌnz blʌd/

1.
流淌在某人的血液裡, 與生俱來
if an ability or quality is in someone's blood, they have it naturally, often because other members of their family also have it
:
•
Music really seems to be in his blood; his whole family are musicians.
音樂似乎真的流淌在他的血液裡;他全家都是音樂家。
•
She's a natural leader; it must be in her blood.
她天生就是領導者;這一定流淌在她的血液裡。