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"Even though metro trains can meet the demand to transport a large number of passengers from one location to another, it is too costly to build the infrastructure and difficult to control the noise," said Qu Tianwei, chief engineer with CRRC Dalian. "In addition, they cannot run very fast."

"Didi's management loopholes were also exposed in the inspection such as inadequate assessment of drivers' professional qualification and background information, posting threat to public safety," the ministry said.

"Farming relies on weather. The harvest is unstable, but working outside ensures me a steady salary," Chen said, adding that although the environment has changed a lot, the income from working on the farmland is incomparable to working in the factory.

"Education to enhance safety awareness should be provided to students, and legal aid and psychological counseling services should be offered to those in need," he said.

"Facebook's privacy scandal shows that some US technology companies sacrifice their users' interests to meet the demands of political intervention and manipulation both at home and abroad," said Shen Meng, director of boutique investment bank Chanson & Co.