Refers to something that appears grand or imposing but has a weak or unstable foundation; built on shaky ground; lacking a solid basis.
那个新方案虽然看起来很宏伟，但如果细节没有考虑周全，恐怕是丰墙峭址，最终难以实施。
Although the new plan appears grand, if the details are not thoroughly considered, it might be like high walls with a steep foundation, ultimately difficult to implement.
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