形容词
中文翻译：僵硬的
同义词：
['stiff', 'unyielding', 'rigidly']
例句：
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1. The material is very rigid and cannot be easily bent.
这种材料非常坚硬，不易弯曲。
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2. She was determined to succeed despite the rigid rules.
她决心不顾严格的规则取得成功。
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3. The structure of this model is very rigid, making it difficult to modify.
这个模型的结构非常僵硬，难以修改。