动词中文翻译
中文翻译：使变硬
同义词：
['make hard', 'make solid', 'harden']
例句：
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1.The metal will harden when it's exposed to the cold air.
金属在暴露于冷空气中会变硬。
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2. The ground hardened after the rain.
雨后地面变硬了。
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3. Hardening is a process that makes steel stronger and more durable.
硬化是一种使钢变得更强更耐用的过程。