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"Globally, however, it is not easy for AI to identify ivory images, since there is a large variety of ivory products and images of ivory might look like porcelain or jade," Peng said.

"Guangzhou is very different compared with my hometown," she said.

"Foreign students can take courses related to the Internet, global trade and cross-border e-commerce and also gain firsthand experience of the development of China's digital economy," he said.

"Food and exercises are helpful to alleviate my disease syndromes, but it is hard to keep up with dieting and exercise without supervision," Zhang said.

"Free trade is the best policy," said Dollar. "It is impossible to fine-tune trade policy to help a geographic region or group of workers. And it is better to concentrate on easing the adjustment as production and jobs naturally evolve."