形容词
中文翻译：坚硬的
同义词：
['stiff', 'unyielding', 'inflexible']
例句：
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1. The material is extremely rigid and cannot be bent easily.
这种材料极其坚硬，不易弯曲。
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2. The road was so rigid that it made driving difficult.
这条路非常硬，使得驾驶变得困难。
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3. The new law is very rigid and requires strict compliance.
新法律非常严格，要求严格执行。