尿素塑料(类)
A clathrate compound, such as urea. 包合物一种笼状化合物，如尿素
But 120 tons of urea is really a small one. 但120吨尿素确实是个小数目。
Government tender urea must submit price by 18th noon. 政府招标尿素，须于18日正午前报价。
They are often synthesized from isocyanates or substituted ureas. 其合成方法主要有异氰酸酯法和取代脲法等方法。
Allantoin is one of the important urea derivative products. 尿囊素是一种重要的尿素衍生产品。
A kidney also takes urea and mineral salts out of the blood. 肾还排出血液中的尿素和无机盐。
