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Beijing has a four-tier alert system for pollution, with red being the highest, followed by orange, yellow and blue.
Apple has committed to invest 3.5 billion yuan (500 million U.S. dollars) in the centers, according to an announcement on the company website Friday.

He said there have been several cases of use of chemicals as weapons in Syria, and therefore China supports OPCW in conducting the probes into all cases so as to reach conclusions based on substantive evidence that can "stand the test of time and facts."
The patient, who has only been identified by her surname Yang, developed symptoms on Feb. 4. She was hospitalized four days later as she had close contact with her daughter, who tested positive for H7N9 virus and died on Feb. 7.
Both China and India are victims of terrorism, and the two sides share the same goal on the issues, Geng said, adding that China and India must maintain cooperation in fighting terrorism, and China will enhance the cooperation to contribute to regional peace.
来源:资阳报