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[问][358]《大学英语》精读第四册第3单元、第5单元中分别有这么两句:I only know that they;,ire round.and they may perfecdy well be flat dises.(我只得知他们是圆的,而它们完全可能是扁平的圆盘状。)和 Armed with such a precept,a numberof doctors may slip into deceptive practices that theyassume will“do no harm”and