251．(be) equivalent to (=equal in value, amount, meaning) 相等于，相当于
252．in essence (=in its/one's nature) 本质上
253．at all events (=in spite of everything, in any case) 不论怎样，无论如何
254．in any event (=whatever happens in the future) 无论如何，不管（将来）怎么样
255．in the event that (=if) 假如，如果。in the event 结果，实际情况是（常与but连用）
256．in the event of (＝in case of ) 万一，即使发生……时
257．except 除……以外；besides 除……以外还有……
258．except (=but) 除了。
259．except for (=apart from) 除……以外
260．(an) exception to ……的例外
261．with the exception of (=except, apart from) 除去……，除……以外
262．in excess of (=more than)超过
263．exchange...for以……交换
264．exclusive of (=not taking into account; without)不包括
265．in excuse of作为……的借口
266．exert...on...对……施加……
267．exert oneself to do sth．努力，使劲
268．come into existence (=begin to exist)开始存在；come into use开始使用；come into effect开始运转；come into fashion开始时新；come into action开始行动；come into power开始执政；come into sight进入视野；come into blossom开花；
269．(be) in existence存在come into existence出现
270．expect……of在……期望……
271．at the expense of在损害……情况下，以……为牺牲
272．expose...to...使暴露于……，使……受（危险，风险）
273．be exposed to...面临……，受到……
274．beyond expression (= in a manner that cannot be expressed)无法形容，说不出的
275．give expression to表达，表现
find expression in表现
276．to...extent在……程度上
277．in the extreme (=extremely)极其
278．look sb. in the eye正视，打量（某人）
279．close (shut) one's eyes to不理会，视而不见
280．in one's mind's eye在心目中，在想象中
281．in the twinkling of an eye一眨眼，转眼间
282．keep an eye on (=keep a watch on)照看，监视
283．in the eyes of in one's eyes (= in the judgment of)在某人看来，在某人眼里
284．on the face of it (=judging by what one can see)表面看来
285．in the face of面对着（困难等情况）
286．in one's face当着某人的面；face to faced面对面；face up to大胆面向
287．fail in (=be unsuccessful in)失败
288．in good faith (=honestly，sincerely)真诚地
289．keep faith with对……守信用
290．lose faith in对……失去信心
291．on faith毫无怀疑地，依赖地
292．faithful to (=loyal to)对……忠诚
293．fall into the habit (of)养成……习惯
294．fall short of (=fail to reach a desired result, standard, etc.)没达到，低于
295．familiar with熟悉，了解
296．have a fancy for (=like sth. without the help of reason）（没有道理地）喜欢，想要
297．take a fancy to (=become fond of)喜欢
298．by far远，非常（与比较级或最高级连用）
299．far from远远不是
300．far from非但不……（而且）