the couse of formation

• 形成原因

the couse of formation的用法和样例：

例句

1. The causes of pedophilia are unknown.
   尚不清楚娈童癖的形成原因。
2. Formation of phenolic tar during separation of products from diphenols synthesis by phenol hydroxylation was studied.
   对苯酚羟基化合成苯二酚产物分离过程酚焦油的形成原因进行了研究。