请问英语中什么是"复合名词"?

多个名词加在一起成为一个新的名词。

我们通常可以以两种形式表达两个名词间的关系：

附属关系。例如：the US bank's finance division
the finance division of the US bank
复合关系。例如：the US bank finance division

有时候以上3种形式可自由替换，其他时候只有其中一种形式比较适用。

附属名词：用's还是用of？

我们通常在表示主人和附属品时，人和动物时，私人或工作关系时，及事务的来源时（如国家，城市，组织等等）用到's形势。例如：

Mark's uncle has just bought a Porsche Boxter.
Mark's Uncle Frank is Sheila's oldest brother.
Pig's liver is full of iron and vitamins.
He has strange tastes: he prefers goat's milk to cow's milk.
Stan's new secretary is not even computer literate.
The company's difficulties should not be underestimated.
Scotland's natural beauty is on a par with Finland's.

以上多种关系中与国家和组织的关系（可延展到一切不可动事物）通常既可以用's也可以用of来表达。例如：

The policy of the company / the company's policy is to recruit staff from all EU countries.
Poland's history /