名词
中文翻译：尿素
同义词：
['ammonia', 'nitrate']
例句：
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1. Urea is a common fertilizer used in agriculture.
尿素是农业中常用的肥料。
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2. The soil needs to be enriched with urea to improve its fertility.
土壤需要用尿素来提高其肥力。
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3. The farmers applied urea to the fields to increase crop yields.
农民们在田地里施用尿素以提高作物产量。