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ScienceDirect
www.sciencedirect.com - 2019-10-24 详细 -
Global Home: UPS - United States
www.ups.com - 2019-07-31 详细 -
Reuters.com
Reuters.com brings you the latest news from around the world, covering breaking news in business, politics, entertainment, technology, and more in video and pictures.
www.reuters.com - 2010-01-28 详细 -
MIT - Massachusetts Institute of Technol
www.mit.edu - 2019-12-13 详细 -
FedEx Global Home - Choose Your Location
Welcome to FedEx.com - Select your location to find services for shipping your package, package tracking, shipping rates, and tools to support shippers and small businesses
www.fedex.com - 2019-07-31 详细