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"For example, how to ensure the security and reliability of self-driving vehicles? What will happen after autonomous vehicles are driven on the road? What if driverless vehicles cannot recognize gestures of traffic police?"

"Free trade zones reflect China's policy of opening-up and the benefits will mainly lie in the liberalization and facilitation of trade and investment," said Huang Xianhai, vice-dean of the School of Economics at Zhejiang University.

"From a longer-term perspective, despite some short-term pain, deleveraging will help create a healthier macro landscape. Other factors, like trade friction, may cause market turbulence but not changing the bigger picture."

"Greenhouse gas concentrations－which are already at their highest levels in three million years－have continued to rise," said Petteri Taalas, the WMO's secretary-general. "This report shows that while many aspects of our lives have been disrupted in 2020, climate change has continued unabated."

"From normal round grinding wheels to cam and triangular ones, we have made many improvements. These grinders are like paint brushes, which can create different patterns with various textures on the glass," he said.