They then traverse a substitution chain of element declarations or a type hierarchy to determine whether the element declaration satisfies the substitution or type derivation requirements.
然后遍历元素声明的代替链或类型层次结构，以决定元素声明是否满足代替或类型衍生要求。
2
This is a logistic derivation that concerns chain of industry of network movie and TV.
这是一个关乎网络影视产业链的逻辑推导。
3
Our derivation of the chain rule contains one flaw.