名词
中文翻译：硬化
同义词：
['harden', 'solidify', 'stiffen']
例句：
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1. The metal has been properly hardened to resist corrosion.
金属已经适当硬化，以抵抗腐蚀。
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2. The ground is starting to harden after the rain.
雨后地面开始硬化。
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3. The paint has hardened enough for us to touch it without getting our fingers dirty.
油漆已经硬化到我们可以触摸而不弄脏手指的程度。