rate element

• 测快慢单元

rate element的用法和样例：

例句

1. In the reaction process of IC with wood, the reaction rate was significantly influenced by the tridimentional inerratic structure of cellulose, while hydroxy showed lesseffect.
   在木材与异氰酸酯反应过程中，纤维素的立体规整性结构对于反应进行的快慢起主要作用，羟基的作用则相对较弱。