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unknown/
^n'nəun
/
1.adjective [+fact] [ number]
未知的
2.adjective [+writer] [ artist]
名不见经传的
3.adjective [+person]
(unidentified) 陌生的
4.noun [c]
(person) 无名小卒
5.noun [s]
(thing) 未知事物
he was unknown to me
我不认识他
unknown to me, he...
不为我所知，他…
it is not unknown for travellers to forget their passports
旅客忘带护照的事并不少见
an unknown quantity
一个未知数
fear of the unknown
对未知事物的恐惧