动词短语
中文翻译：皮肤硬化
同义词：
['harden', "harden up例句：1. The sun's rays have hardened the skin on my face.（太阳的光线已经使脸上的皮肤变硬了。）2. The old man's hands were hardened by years of manual labor.（这位老人的手因为多年的手工劳动而变得粗糙。）3. The paint has hardened over time", 'making it difficult to remove.（油漆随着时间的推移变硬，很难擦掉。）']
例句：
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1. The sun's rays have hardened the skin on my face.
太阳的光线已经使脸上的皮肤变硬了。
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2. The old man's hands were hardened by years of manual labor.
这位老人的手因为多年的手工劳动而变得粗糙。
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3. The paint has hardened over time, making it difficult to remove.
油漆随着时间的推移变硬，很难擦掉。