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burnish:磨光,擦亮(金属)
to burnish the image of someone or something means to improve their image 提升形象
run out of steam:lose the energy, enthusiasm, etc. that you had before 泄气,精疲力尽,丧失热情
His presidential campaign began well but ran out of steam after a couple of months. 他的总统选举活动开始还搞得有声有色,可是几个月后就偃旗息鼓了.
