动词
中文翻译：使变硬
同义词：
['harden', 'toughen例句：1. The paint on the wall has begun to faceharden.（墙上的油漆开始变硬了。）']
例句：
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1. The paint on the wall has begun to faceharden.
墙上的油漆开始变硬了。
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2. The old wooden chair was facedhardened by years of use.
这把旧木椅被岁月磨砺得更加坚硬了。
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3.The ground beneath his feet felt facehardened and unyielding.
他脚下的土地感觉坚硬且不易变形。