n.尿烷；氨基鉀酸酯
We need a tool for turning a groove into the urethane wheels. 我們需要一個工具的聚氨酯輪子轉(zhuǎn)成一個槽。
Urethane acrylates are expensive compared to other classes of acrylates. 聚氨酯丙烯酸酯比其它類型的丙烯酸酯貴。
n.聚氨基甲酸乙酯
