unknown:
adj. 未知的陌生的，默默無聞的
n. 未知數未知的事物，默默無聞的人
His work is practically unknown here .他的作品在這裏實際上不為人知。
What will the unknown devil bring ?這個摸不透的惡魔會帶來什麼呢
The date of birth and death of qu yuan is unknown .屈原的生卒年月不詳。
His whereabouts have been utterly unknown so far .迄今他的下落全然未知。
His present whereabouts is unknown .他現在下落不明。
unknown to sb.
揹着某人在某人不知曉的情況下
例句:
Unknown to her， I had already seen my lawyer.(我已經揹着她見過我的律師了。)
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