形容词
中文翻译：坚固的
同义词：
['solid', 'robust', 'sturdy', 'firm', 'tough']
例句：
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1. The rock is incredibly hard and cannot be carved with a knife.
这块岩石非常坚硬，不能用刀雕刻。
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2. The tree trunk is so solid that it can support the weight of a car.
这棵树干非常坚固，可以支撑汽车的重量。
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3. The ground was too hard to walk on, making it difficult for us to move around.
地面太硬了，走起来很困难，我们很难移动。