ureidohydantoin

例句：

1. 1. Urea is acommon chemical used in fertilizers.
   尿素是一种常见的化学肥料成分。
2. 2. The plant producesurea as a natural defense mechanism.
   这种植物通过产生尿素作为一种自然防御机制。
3. 3.Urea is often used as a foodadditive to improve the texture of meat products.
   尿素常被用作食品添加剂，以改善肉类产品的质地。