two of its biggest markets = Europe and the United States ?

Context:

The fear is that a failure to contain the crisis would lead to contagion in global financial markets on par with the Lehman Brothers debacle, and deliver a blow not only to the economies of Europe, but also to the United States and other major trading partners.

Such a deterioration would certainly be bad news for China, which could hardly afford to see two of its biggest markets hobbled at the same time.

More:
http://www.nytimes.com/2011/10/29/world/asia/europe-seeks-chinese-investment-in-euro-rescue.html?_r=2&hp