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

我们不知道哪些行为特征是遗传，哪些是后养成。

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或是烧疤痕挛缩类后修复，往往都没错。