形容词
中文翻译：坚硬的
同义词：
['stiff', 'unyielding', 'rigidly']
例句：
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1. The material is very rigid and cannot be easily bent.
这种材料非常坚硬，不易弯曲。
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2. The structure of the bridge is rigid, which makes it stable.
桥梁的结构是坚固的，这使得它稳定。
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3. The spider's web is rigid, but it can still catch insects.
蜘蛛网很硬，但它仍然能捕捉昆虫。