名词
中文翻译：不稳定的框架
同义词：
['unstable structure', 'unstable framework']
例句：
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1.The new car has an unstable frame that needs to be repaired urgently.
新车有一个不稳定的框架，需要紧急修理。
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2.The old building had a very unstable frame and needed to be replaced.
这座旧建筑有一个非常不稳定的框架，需要被替换。
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3. The engineer carefully inspected the unstable frame of the bridge before beginning repairs.
工程师在开始修复桥梁之前仔细检查了桥的不稳定框架。