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An employee works on the assembly line of a smart car factory in Hambach, eastern France. [Photo/Agencies]

An international drug-trafficking channel in southern China has been busted following a crackdown on a major cross-border drug gang in the Shenzhen special economic zone, police said on Friday.

Among top 500 firms, the key technologies of 402 companies were mainly developed independently, accounting for 80.4 percent of the total. The number of valid patents obtained by the top 500 firms increased by 8.46 percent in 2019, while the figure for international patents also grew significantly.

An expert team of four doctors departed from Guangzhou, South China's Guangdong province, on March 8, 2020 to help treat people injured in the collapse of a hotel in Quanzhou, East China's Fujian province. (Photo provided to chinadaily.com.cn)

An investigation found that Batmenkh's family members helped him apply for medical parole in 1993 because he had kidney disease, but he didn't return to the detention center when the one-year parole term expired, according to the report.