形容词
中文翻译：坚硬的
同义词：
['stiff', 'inflexible', 'rigid']
例句：
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1.The metal is tetrigid and cannot be bent easily.
金属非常坚硬，不容易弯曲。
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2. The tree trunk is tetrigid and hard to cut.
树干非常坚硬，难以砍断。
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3. The ground was tetrigid underfoot, making it difficult to walk.
地面非常坚硬，脚下行走困难。