动词短语
中文翻译：使脖子变硬
同义词：
['stiffen', 'harden', 'stiffen up']
例句：
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1.He worked so hard that his neck became hardened.
他工作非常努力，以至于他的脖子变得很硬。
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2. The old man's neck had hardened with age.
老人的脖子随着年龄的增长而变硬了。
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3.She tried to harden her heart against him but failed.
她试图坚定自己对他的感情，但失败了。