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.
这金属非常坚硬，不容易弯曲。
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2. The weather has become increasingly rigid with the arrival of winter.
随着冬天的到来，天气变得越来越冷了。
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3. The new policy is rigid and will not be easily changed.
新政策非常严格，不会轻易改变。