动词中文翻译
中文翻译：使变硬
同义词：
['harden', 'fortify', 'harden up例句：1. The frost has hardened the ground.（霜冻使地面变硬了。）2. He worked hard to harden his skills.（他努力工作，以增强他的技能。）']
例句：
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1. The frost has hardened the ground.
霜冻使地面变硬了。
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2. He worked hard to harden his skills.
他努力工作，以增强他的技能。
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3. The old house was hardened by time and neglect.
老房子因时间流逝和忽视而变得坚硬。