Hold thigh behind knee and bring one knee up to chest. Hold 20 seconds.
单膝向胸部收缩。——平躺，双膝弯曲。膝盖上提，单膝靠近胸部，保持20秒。
knee joint flexion and extension exerciser
膝关节弯曲伸长训练器
bent his knees and knelt;
弯曲他的双膝跪下；
have legs that curve outward at the knees.
双腿在膝盖处向外弯曲。
Crouch down
曲膝弯腰以便少占地方，卷缩，弯腰低头
Having kneelike joints;able to bend at an abrupt angle.
膝状的有膝状关节的；能以较陡的斜度弯曲的
the act of bending the knees in worship or reverence.
崇拜或者尊敬时弯曲双膝的动作。
Touch your toes without bending your knees.
用手够到你的脚趾, 膝盖别弯曲.
Something resembling the human knee, such as a bent piece of pipe.
膝状物类似于人的膝关节的东西，例如管子的弯曲部分
a swimming kick; the legs are moved rapidly up and down without bending the knees.
一种游泳的踢；腿快速上下活动而膝盖不弯曲。
bending the head or body or knee as a sign of reverence or submission or shame.
点头、弯曲身体或者膝盖，表示尊敬、屈服或者羞耻。
I couldn't bend my knees, so I was drudging along with the poles.
我不能弯曲我的膝盖,我用杆子艰难行进。
In the tuck position,a diver's Body shall be compact,Bent at the knees and hips with the knees and feet together,hands 0n the lower legs and the toes pointed.
在抱膝姿势中,运动员身体团紧,膝髋弯曲,双膝、双脚并拢,两手置于小腿处,脚尖绷直。
A horse of a breed developed in England, having a gait characterized by pronounced flexion of the knee.
海克尼挽马一种英国培育的马种，该马跨步时膝盖有明显的弯曲
He laid her card and letter on the twill bedspread near the curve of her knees.
他把明信片和信放在斜纹布面床单上，靠近她膝头弯曲的地方。
It is not a mater of rosy cheeks, red lips and supple knees;
它不是指红润的脸颊，红色的嘴唇和柔软弯曲的膝盖；
Our arms and legs bend at the joints- the elbows and knees.
我们的胳膊和腿在关节处——即胳膊肘儿和膝盖处弯曲。
To bend(the head, knee, or body)to express greeting, consent, courtesy, acknowledgment, submission, or veneration.
鞠躬弯曲（头、膝或身体）以表达问候、满意、谦恭、感谢、屈服或崇敬