66、turn one’s back on sb. 不理睬(某人),背弃,抛弃
同义替换：
turn away from sb. in an impolite way
造句：
We cannot turn our back on the world outside.
我们不能不去理睬整个世界。
67、behind one’s back 背着某人(说坏话)
造句：
Don' t speak ill of him behind his back.
别在背后说他坏话。
68、be based on upon 基于
base原始涵义：
n.基础, 底座The lamp stands on a circular base.这盏台灯是装在圆形底座上的。
基地, 根据地The country maintains military bases on foreign soil.那个国家在国外设有军事基地。
vt.把…建立在, 以…为基础One should always base one's opinion on facts.我们应总是把自己的观点建立在事实的基础上。
基于;以…为根据(on， upon)He based the book on his own life.他根据他自己的生活写这本书。
vi.基于(on, upon)Fluctuating prices usually base on a fickle public's demand.物价的波动往往因公众需求的变化而造成。
真题重现：
Superhigh scores like vos Savant's are no longer possible, because scoring is now based on a statistical population distribution among age peers.
人们已经不可能得到像萨凡特那么高的分数了，因为现在的得分以各年龄段的人口统计学分布为依据。 (2007阅读)
造句：
A visual interface is based on visual patterns.
视觉模式是视觉界面的基础。
69、on the basis of 根据…, 在…基础上
basis原始涵义：
n.基础,要素;基点The simplest basis for classification is in terms of structure or texture.最简单的分类基础是结构或构造。
真题重现：
On the basis of their models, scientists are of the opinion that the climate of the world should be becoming cooler.
科学家根据他们的模型，认为全球的气候应该是在变冷。 (1992阅读)
造句：
On the basis of the evidence we deduced that he was guilty.
根据这些证据,我们推论他是有罪的。
70、beat…at 在…运动项目上打赢
beat原始涵义：
vi. (心脏等)跳动His heart was still beating.他的心脏还在跳。
(翅膀)扑扇;有节奏地拍动;颤动，震动The wings of the sea gull were beating frantically.海鸥的翅膀在疯狂地扑扇着。
vt. & vi.接连地击打It is wrong to beat others.打人是不对的。
vt.打败At last they beat their enemy.最终, 他们打败了敌人。
n.敲打, 敲打声We heard the beat of a drum.
造句：
He said that no one could beat him at tennis, but he had to eat his words after losing several games.
他说过打网球谁都赢不了他，可是输了几场比赛后他不得不认错了。
