unknown number
未知數
unknown soldier
（美）陣亡的無名英雄
exploration into unknown territory.
對未知領域的探索。
a headache of unknown aetiology
原因不明的頭痛
a word of unknown origin
來源不明的詞
It was unknown country to me.
這地區對我說來是陌生的。
inventions unknown to antiquity.
古人所不知的發明
There are many unknowns in science.
科學上還有許多未知之處。
The cause of autism is unknown.
自閉症的病因尚不清楚。
Motherhood was for her a journey into the unknown.
做母親當時對她來說是開始一次探險之旅。
Our new director is still an unknown quantity.
我們對新來的主管知之甚少。
he's relatively unknown on this side of the pond.
他在大西洋這一側不是那麼出名。
find the unknown in the following equations.
從下列方程式中找出未知量。
an unknown and untravelled wilderness.
一片不爲人知、人跡罕至的荒野。
They bowed in homage to the Unknown Soldiers.
他們向無名烈士墓鞠躬致敬。
Matter is an unknown somewhat .
物質是某種不明的東西。
cast an unknown in the starring role.
讓一名無名小輩擔當了主角
a train wreck with an unknown number of casualties.
一次不知傷亡人數的火車事故
You must eliminate an unknown quantity.
你必須消去一個未知數。
The championship was won by a complete unknown.
一個名不見經傳的人贏得了冠軍。
We were driving to an unknown place, on an unknown errand.
我們既不知道上哪裏去，又不知道去做什麼。
來源: The Sign of the FourThe impact on health is as yet unknown.
目前尚不明確血液中的微塑料對健康的影響。
來源: Selected English short passagesBut actually, still to have had so many unknowns.
但其實，還是有那麼多的未知。
來源: Connection MagazineChris Lewicki has faced these unknowns.
克里斯·劉易基要面對這些未知數。
來源: Searching for life on MarsYou know, it isn't the unknown.
你知道，它們是經過訓練的。
來源: CNN 10 Student English December 2022 Collection" There are too many unknowns to make a reasonable valuation, " Arenillas notes.
“這裏有太多的未知因素了，所以很難做出合理的估值。”
來源: Selected English short passagesAnd things unknown proposed as things forgot.
教育人類，必須以潛移默化的方式；對方未知之事權當是他遺忘了而已。
來源: The Weaknesses of Human Nature (Part 2)With this previously unknown galactic government?
你是不是和我們講一下？
來源: Rick and Morty Season 2 (Bilingual)46. Nowadays the once unknown snowy hill is well-known for snowstorm.
如今那座曾經不出名的多雪小山因暴風雪而出名。
來源: Remember 7000 graduate exam vocabulary in 16 days.There are still many unknowns and the more scientists uncover, the more questions arise.
還有很多未知因素，科學家發現的越多，問題就越多。
來源: CNN 10 Student English March 2018 Collectionunknown number
未知數
unknown soldier
（美）陣亡的無名英雄
exploration into unknown territory.
對未知領域的探索。
a headache of unknown aetiology
原因不明的頭痛
a word of unknown origin
來源不明的詞
It was unknown country to me.
這地區對我說來是陌生的。
inventions unknown to antiquity.
古人所不知的發明
There are many unknowns in science.
科學上還有許多未知之處。
The cause of autism is unknown.
自閉症的病因尚不清楚。
Motherhood was for her a journey into the unknown.
做母親當時對她來說是開始一次探險之旅。
Our new director is still an unknown quantity.
我們對新來的主管知之甚少。
he's relatively unknown on this side of the pond.
他在大西洋這一側不是那麼出名。
find the unknown in the following equations.
從下列方程式中找出未知量。
an unknown and untravelled wilderness.
一片不爲人知、人跡罕至的荒野。
They bowed in homage to the Unknown Soldiers.
他們向無名烈士墓鞠躬致敬。
Matter is an unknown somewhat .
物質是某種不明的東西。
cast an unknown in the starring role.
讓一名無名小輩擔當了主角
a train wreck with an unknown number of casualties.
一次不知傷亡人數的火車事故
You must eliminate an unknown quantity.
你必須消去一個未知數。
The championship was won by a complete unknown.
一個名不見經傳的人贏得了冠軍。
We were driving to an unknown place, on an unknown errand.
我們既不知道上哪裏去，又不知道去做什麼。
來源: The Sign of the FourThe impact on health is as yet unknown.
目前尚不明確血液中的微塑料對健康的影響。
來源: Selected English short passagesBut actually, still to have had so many unknowns.
但其實，還是有那麼多的未知。
來源: Connection MagazineChris Lewicki has faced these unknowns.
克里斯·劉易基要面對這些未知數。
來源: Searching for life on MarsYou know, it isn't the unknown.
你知道，它們是經過訓練的。
來源: CNN 10 Student English December 2022 Collection" There are too many unknowns to make a reasonable valuation, " Arenillas notes.
“這裏有太多的未知因素了，所以很難做出合理的估值。”
來源: Selected English short passagesAnd things unknown proposed as things forgot.
教育人類，必須以潛移默化的方式；對方未知之事權當是他遺忘了而已。
來源: The Weaknesses of Human Nature (Part 2)With this previously unknown galactic government?
你是不是和我們講一下？
來源: Rick and Morty Season 2 (Bilingual)46. Nowadays the once unknown snowy hill is well-known for snowstorm.
如今那座曾經不出名的多雪小山因暴風雪而出名。
來源: Remember 7000 graduate exam vocabulary in 16 days.There are still many unknowns and the more scientists uncover, the more questions arise.
還有很多未知因素，科學家發現的越多，問題就越多。
來源: CNN 10 Student English March 2018 Collection探索常見搜尋詞彙