curve: implies following or producing a line suggesting the arc of a circle or ellipse: the road ~d sharply to the left. ellipse椭圆
bend: suggests a yielding to force and implies a distortion from the anticipated, normal, or desired straightness: metal rods ~ under the immense weight. （yield指外力下变形to give way by force，如a mattress that yields to pressure垫子受力会变形） （distort扭曲变形implies a wrenching from the natural, normal, or true shape, form, direction指受到拧或拉，导致形状外观方向等变得不自然正常真实，如the odd camera angle distorts his face in the photograph奇怪的照相角度导致他的脸在相片中变形）
turn: implies change of direction essentially by rotation and not usually as a result of force or pressure: the comet will ~ toward the earth. （rotate旋转to move in a circle around a center，如the daily rotation of the earth on its axis地球每天自转） （我们知道阿甘正传里珍妮唱的<blowing in the wind随风飘荡>，是一首反越战歌曲: how many roads must a man walk down before they call him a man一个人要走多少路，别人才称他是个人，how many seas must a white dove sail before she sleeps in the sand白鸽要翱翔多少海洋，才能安息在沙滩......有how many times can a man turn his head, and pretend that he just doesn't see一个人能转多少次头，假装自己看不见，这是讽刺战争发动者不顾他人牺牲生命，转头假装看不见。是反战运动圣歌Bob Dylan成名作，阿甘恰巧是在赴越南前听到珍妮弹唱） （I'm turning my head up and down, I'm turning (5x) around, and all that I can see is just another lemon tree我上下左右转头看，只看到柠檬树，1996年问世清新欢快，什么事都不用想不用做just turn his head up and down and around）
twist: implies the influence of a force having a spiral effect throughout the object or course involved: the ~ed wreckage of a spacecraft. （这个词意义丰富，还表示歪曲曲解to mispresent，如the newspaper was accused of twisting the facts这家报纸被指责歪曲事实，如you always twist everything I say你总是歪曲我说的每一句话；这个词表示拧to turn with hand，如she gave the lid another twist and it came off她又拧了一下，盖儿开了，还常表示意想不到的变化an unexpected change，如the story has taken another twist故事情节再一次变化，如the disappearance of a vital witness added a new twist to the case一名重要证人失踪，令诉讼出现了新的变数，如by a curious twist of fate we met again only a week or so later由于命运巧妙的安排，大约只过了一周我们又相逢了。本组最后两个词结合在一起twists and turns是个固定搭配: 一波三折，如the twists and turns of his political career他政治生涯一波三折） (spiral螺旋，不停旋转to wind round and round，如a spiral staircase螺旋形楼梯，如production costs began to spiral生产成本开始螺旋式上升(升得越来越快)，如the upward/downward spiral of sales螺旋式上升/下降的销售额（升或降越来越快），spiral螺旋式表示”越来越“）
curve曲线转弯: 指沿着圆弧线前进，bend变弯: 表示受到外力，离开正常直线，变得扭曲变形，turn转向: 指自身旋转改变方向，并非受外力，twist旋转扭转: 指物体受到螺旋式外力的作用
记忆方法: 1）首字母CBTT谈吐不错<==转动自如
2）转动的意思是从直线转离mean to swerve or cause to swerve from a straight line or course. swerve突然转向，把s想成sudden
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