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"For example, if a homegrown enterprise plans to extend its business abroad, it can obtain one-stop legal advice regarding policies both at home and abroad at such a cooperative office," Zhang said.

"Generally, there has been a decline trend in the frequency," he said.

"German premium providers still lack groundbreaking e-vehicles or important connectivity functions," said study author Stefan Bratzel.

"For example, in Shanghai, we invite professors to speak about the folk customs and history of the old city. It's not always about promoting books, but to add a cultural atmosphere to the bookstore. We are also building up a social circle for our readers with the same interests," Zhang said.

"Given the seriousness of the matter and the importance of public health, (it intends to) also request approval for its use and emergency distribution," he said.