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"China's program to electrify road transport has set an example for the world in green development approaches," said Erik Solheim, executive director of the UN Environment Programme (UNEP).

"China's civil aviation industry has made a great contribution to the country's economic growth," said Zhang Qihuai, a senior lawyer who specializes in civil aviation, adding that more development can be expected in terms of safety, infrastructure, public transport and general aviation.

"China's pledge to further open its market to foreign companies tremendously improves the country's economic development, making the Chinese market one of the most attractive in the world," Zhou said.

"Criminals today are using more complicated methods and becoming better hidden, which adds more difficulties to our investigation," Chen said.

"China's smartphone market is declining because consumers are holding on to their phones for longer, operators like China Mobile have reduced their smartphone subsidies, and device makers such as Huawei have launched fewer 'wow' models to tempt shoppers back into retail stores. Some consumers are finding their smartphones 'good enough' and are pausing on upgrading," Neil Mawston, executive director at Boston-based Strategy Analytics, said in an email.