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"Energy has been the trigger for the previous three industrial revolutions and we now must be ready to meet the challenge of the fourth," he said.

"Exploring the Red Planet with NASA's Mars Helicopter exemplifies a successful marriage of science and technology innovation and is a unique opportunity to advance Mars exploration for the future," said Thomas Zurbuchen, associate administrator for NASA's Science Mission Directorate at the agency headquarters here.

"Farmers only grew a few mugwort plants around their houses for their own use, and never thought of growing more for sale," Wang, a businessman from Qingdao, Shandong province, said. "For two years I could not get any mugwort, despite visiting the whole county."

"Dressed in protection suits, we couldn't wear a thick down jacket, only a sweater and a shirt in temperatures of about -20 C," Hu said.

"Every 100 Chinese households in rural areas owns 43.8 units of air conditioners, while each (group of) 100 urban families has 124 units. In Japan, every 100 households owns 272 units of air conditioners, so China's air conditioner market still has a lot of room to grow," said Yang Jie, general manager of industry consultancy ChinaIOL, adding the rural and urban markets show different demand characteristics.