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the joint between the top and bottom parts of the leg where it bends in the middle 膝；膝盖；膝关节 
a knee injury 膝关节受伤 I had knee surgery three years ago. 三年前我做过膝盖手术。 Bend your knees until you feel your thigh muscles working. 弯曲你的膝盖，直到你感觉到你的大腿肌肉在工作。 I grazed my knee when I fell. 我摔了一跤，把膝盖擦破了。 He went down on one knee and asked her to marry him. 他单膝跪下向她求婚。 - on your knees
She was on her knees scrubbing the kitchen floor. 她在厨房里跪着刷洗地板。 Everyone was down on (their) on (their) hands and knees (= crawling on the floor) looking for the ring. 每个人都跪在地上寻找戒指。 He fell to his knees and begged for mercy. 他跪下乞求宽恕。 My knees were knocking (= I was frightened). 我的膝盖在敲门。
Extra ExamplesTopics Bodya2He dropped to one knee. 他单膝着地。 He hugged his knees to keep warm. 他抱膝取暖。 He patted her knee reassuringly. 他轻拍她的膝盖让她放心。 He slapped his knee as he rocked with laughter. 他拍着膝盖笑得前仰后合。 He's snapped a ligament in his knee. 他弄断了膝盖的一条韧带。 I rested my chin on my drawn-up knees. 我下巴抵在屈起的膝盖上。 Suddenly her knees buckled and she fell to the floor. 她突然双膝发软跌倒在地。 The blow knocked him to his knees. 那一击打得他跪到了地上。 His leg was missing below the knee. 他一条腿的膝盖以下部份没有了。
Oxford Collocations Dictionaryadjective- left
- right
- bony
- …
- bend
- flex
- straighten
- …
- buckle
- give way
- weaken
- …
- injury
- problem
- sprain
- …
- above the knee
- across your knees
- at somebody’s knee
- …
- bring something to its knees
- on your hands and knees
- on bended knee
- …
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the part of a piece of clothing that covers the knee （裤子的）膝部 I brushed the dust from the knees of my trousers. 我掸掉裤子膝盖上的灰尘。 - at the knee
These jeans are torn at the knee. 这牛仔裤膝盖那儿破了。 a knee patch 膝部的补丁
the top surface of the upper part of the legs when you are sitting down （坐下时）大腿朝上的面 Extra ExamplesShe had a blanket draped across her knees. 她把毯子搭在双膝上。 She sat on her father's knee while he read her a story. 她坐在爸爸腿上听他读故事。
Oxford Collocations Dictionaryadjective- left
- right
- bony
- …
- bend
- flex
- straighten
- …
- buckle
- give way
- weaken
- …
- injury
- problem
- sprain
- …
- above the knee
- across your knees
- at somebody’s knee
- …
- bring something to its knees
- on your hands and knees
- on bended knee
- …
More Like This Silent lettersSilent letters
Word OriginOld English cnēow, cnēo, of Germanic origin; related to Dutch knie and German Knie, from an Indo-European root shared by Latin genu and Greek gonu.
Idioms
at your mother’s knee
the bee’s knees
bring somebody to their knees
to defeat somebody, especially in a war （尤指战争中）打败某人，使某人屈膝投降
bring something to its knees
on bended knee(s)
if you ask for something on bended knee(s), you ask for it in a very anxious and/or humble way (= showing you think you are less important than the person you are asking) 下跪（请求…）；央求；苦苦哀求 I’d go down on bended knee if I thought she’d change her mind. 如果我认为她会改变主意，我会跪下来。
put somebody over your knee
to punish somebody by making them lie on top of your knee and hitting their bottom 把某人放在膝上打屁股
weak at the knees