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China's major stock indexes closed lower for a second trading day Wednesday, with the benchmark Shanghai Composite Index down 2.08 percent at 2,723.26 points.

China's major oil and gas giants expect their net profits and net incomes to surge for the first half of this year, benefiting from the revival in crude oil prices, but analysts believe high earnings growth will be hard to maintain in the second half as oil prices are unlikely to rise much above current levels.

China's industrial output is expected to start improving in the fourth quarter, with key indicators already showing signs of a rebound, the nation's top industrial regulator said on Tuesday.

China's online retail transaction volume increased by 35 percent year-on-year to 3.1 trillion yuan in the first half of 2017, and its number of online shoppers reached 516 million, according to data released by the China E-commerce Research Center.

China's national high-tech zones play a vital role in underpinning innovation-driven development and establishing valuable experience for China's high-quality economic development, Xu added.