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Any publisher with a book exclusive to the Kindle store can participate. Publishers can control how long a book is discounted (one hour-to-seven days) and level of discount (at least off regular price).

Another Ethiopian Airlines executive, however, criticized the software on the MAX.

Apart from the treatment of lung cancer, BMS is also exploring immuno-oncology treatments of liver cancer, stomach cancer, esophagus cancer and other high-incidence cancer, Zhao said.

Apart from trading in goods, newer forms of goods exchange have arisen from the second-hand market to meet people's diversified demands, including recycling, donations, borrowing and old-for-new barter.

Apart from State-operated railways, China also has rail lines operated by local governments and enterprises.