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"But the science is clear and the evidence irrefutable: mask-wearing, social distancing, and limits to social gatherings are vital to helping prevent transmission of the virus," he said.

"CDC urgently requests your assistance in expediting applications for these distribution facilities and, if necessary, asks that you consider waiving requirements that would prevent these facilities from becoming fully operational by November 1, 2020," Redfield wrote.

"China is becoming, or already is, one of the global forces in the global economy. We are always trying to refine how we relate to outside investors, especially large investors. So I think China, Japan and India are three major targets that we're trying to talk with all the time," Hickenlooper said.

"Cheng's book contains analyses of key historical facts and criticisms on some points of view, both founded on a substantial body of materials, which makes it very convincing," said Yang Daqing, associate professor of history and international affairs at The George Washington University.

"China back then, and China today, are very different worlds."