形容词
中文翻译：坚硬的
同义词：
['stiff', 'firm', 'stiff']
例句：
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1. The metal is very rigid and cannot be bent easily.
这金属非常坚硬，不易弯曲。
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2. The new policy is very rigid and may cause some difficulties for the implementation.
新政策非常严格，可能会给实施带来一些困难。
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3. The road is very rigid and it's difficult to drive on it.
这条路非常硬，很难在上面行驶。