形容词
中文翻译：勃起的
同义词：
['hard', 'stiff', 'rigid', 'erect', 'stiffened']
例句：
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1. The man was so hard that he couldn't get out of bed.
那人太硬了，以至于他无法起床。
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2. The tree is so stiff that it looks like a statue.
这棵树太直了，看起来像一座雕像。
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3. The fabric is very rigid, making it difficult to shape.
这种布料非常坚硬，很难塑形。