1.The extent of state controlled company assets varies considerably among countries. 国家控制的公司资产的程度在不同国家差异是很大的。（指程度的差异大）
2.(but)The extent of state controlled company assets is high in several European countries and in China。（但是）国家控制的公司资产的程度在一些欧洲国家和中国是很高的 （指程度高）
3. The restructuring of companies in China is considerable. 中国公司的结构重组是很大规模的/可观的。
国家控制的公司资产的程度在不同国家差异是很大的， 但是这个程度在一些欧洲国家和中国是很高的， 尽管中国公司的结构重组是很大规模的/可观的。
There are two types of relation in variations.
One is that there is a completely assured relation in variations.
It can be presented by using the accurate mathematical expression.
The other is that incomplete assured relation exists in the variations.
It can be showed by using the accurate expression
That old man you talked about just now lives in an old house.
My son liked the toy car i bought for him on his birthday.
Do you dare to board a plane which has no pilot in it ?