后天的

We do not know which behavioural traits are inherited and which acquired.

我们不知道哪些行为特征遗传的，哪些养成的。

This was true whether applied to a congenital defect, such as syndactyly, or an acquired defect, such as a burn contracture.

把它们应用于诸如并指的先缺损或烧疤痕挛缩类缺损的修复，往往都没错。