形容词
中文翻译：坚硬的
同义词：
['stiff', 'hard', 'unyielding']
例句：
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1. The material is very rigid and cannot be bent easily.
这种材料非常坚硬，不容易弯曲。
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2. The road was so rigid that it made driving difficult.
这条路非常坚硬，使得驾驶变得困难。
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3. The structure of the building is very rigid, making it difficult to modify.
建筑物的结构非常坚硬，难以修改。