
burnish:磨光,擦亮(金屬)
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 泄氣,精疲力盡,喪失熱情
His presidential campaign began well but ran out of steam after a couple of months. 他的總統選舉活動開始還搞得有聲有色,可是幾個月后就偃旗息鼓了.