Investors talk about stock market at a trading hall in a securities firm in Shanghai, east China, Feb. 21, 2013. Chinese stocks plunged on Feb. 21, with the benchmark Shanghai Composite Index slumped 2.97 percent, or 71.23 points, to end at 2,325.95. The Shenzhen Component Index declined 2.59 percent, or 249.76 points, to 9,396.11. [Xinhua]