unknown

🇬🇧/ˌʌnˈnəʊn/ 🇺🇸/ˌʌnˈnoʊn/📚 19122 55 3四级六级高考
If something is unknown to you, you have no knowledge of it. 不了解的

adjective [原级]未知的,未被确认的;不出名的,无名的;从未发生的,从不存在的

An unknown person is someone whose name you do not know or whose character you do not know anything about. (
姓名或性格) 未知的

noun [抽象名词]无名者,不出名的人;不明情况,未知因素;不为人知的地方,未知的事物(the unknown);(数)未知数,未知量

The unknown refers generally to things or places that people do not know about or understand.
未知事物

unknown 出现在下面的课文中
Lesson 3 An unknown goddess
Lesson 34 A happy discovery
Lesson 45 The power of the press
Lesson 16 The modern city
Lesson 38 Water and the traveller
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