形容词
中文翻译：坚硬的
同义词：
['stiff', 'unyielding', 'inflexible']
例句：
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1. The road was so hard that it was like a rigid surface.
这条路太硬了，就像一块坚硬的表面。
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2. The teacher's lecture was very rigid and did not allow for any questions.
老师的讲课非常严格，不允许有任何问题。
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3. The new rules are very rigid and require everyone to follow them strictly.
新规定非常严格，需要每个人都严格遵守。