形容词
中文翻译：僵硬的
同义词：
['stiff', 'unyielding', 'inflexible']
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. The chair was made of rigid wood, which made it uncomfortable to sit on.
椅子是由坚硬的木头制成的，坐上去很不舒服。
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3. The scientist's research was rigorously tested for accuracy and reliability.
科学家的研究经过严格的测试，以确保准确性和可靠性。