动词
中文翻译：使硬化
同义词：
['harden', 'solidify', 'harden up例句：1. The frost has hardened the ground into a crust.（霜冻已经把地面硬化成一层硬壳。）']
例句：
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1. The frost has hardened the ground into a crust.
霜冻已经把地面硬化成一层硬壳。
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2.The metal will harden as it cools.
金属冷却后会变硬。
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3. The paint needs to be hardened before it dries.
油漆需要硬化才能干燥。