known
🇺🇸
/nəʊn/
🇬🇧
/nəʊn/
recognized or familiar to many people
The cause of the problem is not yet known to scientists.
問題的原因尚未被科學家們所瞭解。
past participle of know
She has known about the secret for years.
她知道這個秘密已經很多年了。