Word · CEFR A2 · Frequency #2087
unknown
未知的事物；未知情况
Any thing, place, or situation about which nothing is known; an unknown fact or piece of information.
- 1.
A variable (usually x, y or z) whose value is to be found.
一个变量(通常是x、y或z),其值需要被找到
- 2.
an unknown and unexplored region
未知且未经探索的区域
- 3.
Any thing, place, or situation about which nothing is known; an unknown fact or piece of information.
任何关于其一无所知的事物、地点或情况；未知的事实或信息
- 4.
anyone who does not belong in the environment in which they are found
不属于所处环境的任何人
- 5.
A person of no identity; a nonentity.
没有身份的人；无名小卒
- 6.
a variable whose values are solutions of an equation
其值为方程解的变量
未知数；未知量；未知区域；未探索之地；局外人；外来者；无名小卒；无足轻重的人；一个变量(通常是x、y或z),其值需要被找到
In use
The young explorer felt both excitement and fear as she set off into the unknown.
After months of research, the cause of the strange noise remained an unknown.
In this math problem, you need to solve for the unknown.
they came like angels out the unknown
Connections
Collocations
- the unknown
- 未知的事物；未知领域
- Explorers have always been drawn to the unknown.探险家们总是被未知领域所吸引。
- fear of the unknown
- 对未知事物的恐惧
- Many people feel anxiety because of their fear of the unknown.许多人因为对未知事物的恐惧而感到焦虑。
- into the unknown
- 走向未知；进入未知世界
- The astronauts were about to fly into the unknown.宇航员们即将飞入未知世界。
- equation with two unknowns
- 含有两个未知数的方程
- In algebra class, we learned how to solve an equation with two unknowns.在代数课上，我们学习了如何解含有两个未知数的方程。
- a complete unknown
- 一个完全陌生的人；无名小卒
- To the talent agency, the young actor was a complete unknown.在这家经纪公司看来，这位年轻演员完全是一个无名小卒。
Learner notes
Memory Tip
拆成 un（不）+ known（知道）：不知道的事就是未知数。
Context & Register
语域：neutral 常见场景：数学解题：求未知数、书面语或新闻：泛指未知的人或情况、探险或文学：指未探索之地、未知领域、身份或背景不明：指没有身份或不属于某环境的人 作名词时通常出现在较正式或书面语境中，如数学题里“求未知数”，或泛指“未知的事物/情况”。日常口语更常用形容词加名词（如 something unknown）来替代。这里的“通常”“多用于”只是提示常见用法，并非绝对限制。
Grammar Note
可数名词，复数形式为unknowns
Pronunciation & Spelling
known、own、grown、thrown、shown、sown 都与 unknown 的重读部分 /noʊn/ 押韵（拼写上对应 -nown 或 -own）。注意 renown 虽然也以 -nown 结尾，但读作 /rɪˈnaʊn/，不押韵；down、town、brown 虽然拼写是 -own，但读作 /aʊn/，也不押韵。
High-value vocabulary
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Usage priority
Collins 词频等级为 3，建议结合例句记忆，而不是只背中文释义。
Learn the forms together
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.