形容词
中文翻译：坚硬的
同义词：
['stiff', 'unyielding', 'inflexible']
例句：
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1. The metal is very rigid and cannot be bent easily.
金属非常坚硬，不容易弯曲。
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2. The road was so rigid that it made walking difficult.
这条路非常坚硬，走路很困难。
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3. The new policy is very rigid and may cause some people to feel frustrated.
新政策非常严格，可能会让一些人感到沮丧。