形容词
中文翻译：坚硬的
同义词：
['stiff', 'rigid', 'inflexible']
例句：
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1. The metal is extremely rigid and cannot be bent easily.
这金属非常坚硬，不容易弯曲。
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2. The chair was too rigid for me to sit on comfortably.
椅子太硬了，我坐不舒服。
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3. The road is very rigid, making it difficult to drive over.
这条路非常坚硬，开车很难通过。