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BNC: 1992 COCA: 1734
rootnoun [ C ]uk/ruːt/ us/ruːt/

root noun [ C ] PLANT PART

B2 the part of a plant that grows down into the earth to get water and food and holds the plant firm in the ground根，根茎，根块

Examples

We moored the boat to a large tree root.

He took hold of the plant's root and pulled.

The tree's roots go down three metres.

Grow the bulbs in a transparent plastic box, so the children can see the roots growing.

We were discussing the roots of the current economic malaise.

root noun [ C ] CAUSE/ORIGIN

C1 the cause or origin of something bad（坏事的）根源，根由，原因

We must get to the root of (= discover the cause of) this problem.我们一定要探本溯源，查出造成这个问题的原因。
What is/lies at the root of the problem is their lack of interest.这一问题的根本原因是他们缺乏兴趣。
The high crime rate has its roots in unemployment and poverty.高犯罪率的根源在于失业和贫穷。
So what's the root cause of his anxiety?那么使他焦虑的根本原因是什么呢？
roots [ plural ]

B2 origins根，根源，起源

The city of Tours can trace its roots back to Roman times.图尔城的历史可以追溯到古罗马时代。
See also
grassroots adjective

root noun [ C ] OF TOOTH/HAIR/NAIL

the part of a hair, tooth, or nail that is under the skin（毛发、牙或指甲的）根部

root noun [ C ] OF WORD

specialized language The root of a word is its most basic form, to which other parts, such as affixes, can be added.词根

The root of the word "sitting" is "sit".sitting 这个词的词根是 sit。

root noun [ C ] IN MATHEMATICS

specialized mathematics a solution of some equations (= mathematical statements)（数学方程式的）根

specialized A root of a particular number is another number that, when multiplied by itself one or more times, reaches that number.根；方根

The square root of 64 is 8, and the cube root of 64 is 4.64的平方根是8，立方根是4。

Idiom(s)

put down roots
root and branch
take root
rootverbuk/ruːt/ us/ruːt/

root verb LOOK

[ I usually + adv/prep ] to look for something by turning things over翻找，翻寻

She rooted through/among the papers on her desk.她在桌上的文件中翻来翻去地找东西。
The pigs rooted for acorns in the forest.猪在树林里翻拱找橡子吃。

root verb PLANT

[ I ] to grow roots生根；长出根来

The trees failed to root and so died.这些树没能生根，所以都死了。

Phrasal verb(s)

root around (somewhere)
root for sb
root sth/sb out
root sth out/up

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