Unexpected economic strength in the eurozone and United States in the second quarter has positive implications for China and other emerging countries.

The rebound may support demand in the global markets in the second half of the year and lead th e indebted eurozone out of recession, analysts said, but the recovery won't be a smooth one.

The eurozone's GDP rose 0.2 percent in the second quarter, compared with the first, exceeding market expectations. GDP contracted 0.3 percent in the first quarter, according to the European Union statistics office.