形容词
中文翻译：坚硬的
同义词：
['stiff', 'inflexible', 'rigid']
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 too rigid for me to sit on comfortably.
椅子太硬了，我坐不舒服。
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3. The new policy is designed to make the government more rigid and efficient.
新政策旨在使政府更加严格和高效。