One area where the Chinese tread softly is in the U.S.They recall the abortive 2005 bid for Unocal by China National Offshore Oil (CEO), which ignited a firestorm in the U.S.Congress.

• 有一个领域中国是轻轻走过是在美国，他们回顾了2005年中国海洋石油对优尼科的竞标失败，点燃了在美国国会的争论风暴。