动词
中文翻译：Unknown
同义词：
['roughen', 'harden']
例句：
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1. The oldwooden chair was gradually becoming rougher androugher.
那把旧木椅逐渐变得越来越粗糙。
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2. As the weather got colder, the snow began to hardenon the ground.
随着天气变冷，雪开始在地面上硬化。
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3. Thefarmer used a machine toroughen the soil before planting.
农民使用机器将土壤变硬以便种植。