unknown number
未知数
unknown soldier
（美）阵亡的无名英雄
exploration into unknown territory.
对未知领域的探索。
a headache of unknown aetiology
原因不明的头痛
a word of unknown origin
来源不明的词
It was unknown country to me.
这地区对我说来是陌生的。
inventions unknown to antiquity.
古人所不知的发明
There are many unknowns in science.
科学上还有许多未知之处。
The cause of autism is unknown.
自闭症的病因尚不清楚。
Motherhood was for her a journey into the unknown.
做母亲当时对她来说是开始一次探险之旅。
Our new director is still an unknown quantity.
我们对新来的主管知之甚少。
he's relatively unknown on this side of the pond.
他在大西洋这一侧不是那么出名。
find the unknown in the following equations.
从下列方程式中找出未知量。
an unknown and untravelled wilderness.
一片不为人知、人迹罕至的荒野。
They bowed in homage to the Unknown Soldiers.
他们向无名烈士墓鞠躬致敬。
Matter is an unknown somewhat .
物质是某种不明的东西。
cast an unknown in the starring role.
让一名无名小辈担当了主角
a train wreck with an unknown number of casualties.
一次不知伤亡人数的火车事故
You must eliminate an unknown quantity.
你必须消去一个未知数。
The championship was won by a complete unknown.
一个名不见经传的人赢得了冠军。
We were driving to an unknown place, on an unknown errand.
我们既不知道上哪里去，又不知道去做什么。
来源: The Sign of the FourThe impact on health is as yet unknown.
目前尚不明确血液中的微塑料对健康的影响。
来源: Selected English short passagesBut actually, still to have had so many unknowns.
但其实，还是有那么多的未知。
来源: Connection MagazineChris Lewicki has faced these unknowns.
克里斯·刘易基要面对这些未知数。
来源: Searching for life on MarsYou know, it isn't the unknown.
你知道，它们是经过训练的。
来源: CNN 10 Student English December 2022 Collection" There are too many unknowns to make a reasonable valuation, " Arenillas notes.
“这里有太多的未知因素了，所以很难做出合理的估值。”
来源: Selected English short passagesAnd things unknown proposed as things forgot.
教育人类，必须以潜移默化的方式；对方未知之事权当是他遗忘了而已。
来源: The Weaknesses of Human Nature (Part 2)With this previously unknown galactic government?
你是不是和我们讲一下？
来源: Rick and Morty Season 2 (Bilingual)46. Nowadays the once unknown snowy hill is well-known for snowstorm.
如今那座曾经不出名的多雪小山因暴风雪而出名。
来源: Remember 7000 graduate exam vocabulary in 16 days.There are still many unknowns and the more scientists uncover, the more questions arise.
还有很多未知因素，科学家发现的越多，问题就越多。
来源: CNN 10 Student English March 2018 Collectionunknown number
未知数
unknown soldier
（美）阵亡的无名英雄
exploration into unknown territory.
对未知领域的探索。
a headache of unknown aetiology
原因不明的头痛
a word of unknown origin
来源不明的词
It was unknown country to me.
这地区对我说来是陌生的。
inventions unknown to antiquity.
古人所不知的发明
There are many unknowns in science.
科学上还有许多未知之处。
The cause of autism is unknown.
自闭症的病因尚不清楚。
Motherhood was for her a journey into the unknown.
做母亲当时对她来说是开始一次探险之旅。
Our new director is still an unknown quantity.
我们对新来的主管知之甚少。
he's relatively unknown on this side of the pond.
他在大西洋这一侧不是那么出名。
find the unknown in the following equations.
从下列方程式中找出未知量。
an unknown and untravelled wilderness.
一片不为人知、人迹罕至的荒野。
They bowed in homage to the Unknown Soldiers.
他们向无名烈士墓鞠躬致敬。
Matter is an unknown somewhat .
物质是某种不明的东西。
cast an unknown in the starring role.
让一名无名小辈担当了主角
a train wreck with an unknown number of casualties.
一次不知伤亡人数的火车事故
You must eliminate an unknown quantity.
你必须消去一个未知数。
The championship was won by a complete unknown.
一个名不见经传的人赢得了冠军。
We were driving to an unknown place, on an unknown errand.
我们既不知道上哪里去，又不知道去做什么。
来源: The Sign of the FourThe impact on health is as yet unknown.
目前尚不明确血液中的微塑料对健康的影响。
来源: Selected English short passagesBut actually, still to have had so many unknowns.
但其实，还是有那么多的未知。
来源: Connection MagazineChris Lewicki has faced these unknowns.
克里斯·刘易基要面对这些未知数。
来源: Searching for life on MarsYou know, it isn't the unknown.
你知道，它们是经过训练的。
来源: CNN 10 Student English December 2022 Collection" There are too many unknowns to make a reasonable valuation, " Arenillas notes.
“这里有太多的未知因素了，所以很难做出合理的估值。”
来源: Selected English short passagesAnd things unknown proposed as things forgot.
教育人类，必须以潜移默化的方式；对方未知之事权当是他遗忘了而已。
来源: The Weaknesses of Human Nature (Part 2)With this previously unknown galactic government?
你是不是和我们讲一下？
来源: Rick and Morty Season 2 (Bilingual)46. Nowadays the once unknown snowy hill is well-known for snowstorm.
如今那座曾经不出名的多雪小山因暴风雪而出名。
来源: Remember 7000 graduate exam vocabulary in 16 days.There are still many unknowns and the more scientists uncover, the more questions arise.
还有很多未知因素，科学家发现的越多，问题就越多。
来源: CNN 10 Student English March 2018 Collection探索常用高频词汇