动词短语
中文翻译：使变硬
同义词：
['harden', 'harden up']
例句：
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1.The ground has hardened up after the rain.
雨后地面变硬了。
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2.The meat needs to be hardened up before it can be cooked.
肉需要先变硬才能烹饪。
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3.Hardening up the soil will make it easier for plants to grow.
使土壤硬化会使植物生长更容易。