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"Dogs can hear high-frequency sounds that humans can't. By using such sounds, police can give the animals orders in situations in which they don't want to be heard, or from long distances," said Xu, a trainer at a police dog training base in suburban Beijing that is home to about 270 dogs.

"Digital trade will become the main type of trading in the future," said Wang.

"Every time I attend a skill competition, the male participants say they fear me and do not want to compete against me," Zhao said smilingly. "Why are they scared of me? Do they fear losing to a woman?" she said.

"Even if the whole market attracts new capital, some low-quality stocks may be hurt by the diversion of funds from the existing boards," said Li Ye, an analyst with Shenzhen-based Great Wall Securities.

"E-commerce has played an important role in helping rural areas get out of poverty," said Kong Fusheng, deputy director of the Department of Market System Development at China's Ministry of Commerce.