名词
中文翻译：框架
同义词：
['frame', 'framework', 'structure']
例句：
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1. The architect designed the building with aclear under frame.
建筑师设计了一座建筑，其结构清晰可见。
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2. The newproject has a complex underframe that needs to be carefullyconsidered.
新项目有一个复杂的结构，需要仔细考虑。
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3. The under frame of the bridgeis made of steel and can support heavyloads.
这座桥的框架是用钢制成的，能够承受重载。