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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)ones eyes to不理会，视而不见 280. in ones minds 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 ones 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) | 
