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Amid public outcry over the surge in lung illnesses, multiple states have been cracking down on vaping in recent weeks. New York, Michigan and Rhode Island all have banned the sale of flavored vaping products, while Massachusetts has imposed a four-month ban on sales.

Among the joint efforts is the newly formed China-Africa Environmental Cooperation Center, based in Nairobi, a promising antipollution project, Liu said.

Amazon’s interest in the pharmaceutical business goes back decades. Amazon in 1999 invested in drugstore.com, the Bellevue, Wash.-based distributor of drugs, vitamins, and beauty products that traces its roots to the?early days of the e-commerce revolution. Amazon was thought of as a possible buyer for the company before Walgreens scooped it up in 2011 for 9 million before shutting it down last year.

Among them, Huawei landed at eighth place, and others including Sangfor Technologies, Venustech, Westone Information Industry Inc and Nsfocus were ranked on the list.

Among the museum's collections are also 2,200 autographed books and 2,134 manuscripts of letters by renowned Chinese authors like Mao Dun and Ye Shengtao, according to the official.