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Police said the illegal ivory trade has been dropping in recent years. Last year, the amount of smuggled ivory tracked down by the authorities fell as much as 80 percent from previous peak years.

However, the world economy is still plagued by deep-seated problems and faces many uncertainties and destabilizing factors, Xi pointed out.

The government said PM2.5 levels have been lowered as the city progresses in its 2017 "clean air" targets of replacing coal with clean energy in 4,000 furnaces, removing 300,000 polluting vehicles from roads, and relocating 500 rudimentary manufacturers.

"Instead of having a few media personnel trained in Mandarin, it should be a major requirement that schools that offer journalism and media studies include foreign languages, and one of the key languages should be Mandarin," she said.

The company said it is dedicated to providing quality flight service for passengers around the world.