改弦更张，汉语成语，拼音是gǎi xián gēng zhāng，是指换掉旧的琴弦，再安上新的。比喻去旧更新，改变制度或作法等出自《汉书·董仲舒传》。
我改弦更张背后，有三个理由。
既然美国国债还有投资者买，国会为什么要改弦更张？
Until investors sto buying US Treasurys, why should Congress change its ways?
我们奉劝美方改弦更张，迷途知返，早日回到对话的正确道路上来。
We would advise the U.S. side to change its practice, realize its errors and mend its way, and return to the right track of dialogue as soon as possible.
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