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Apple also introduced the iPhone 8 and iPhone 8 Plus, which resemble the iPhone 7 line but have a glass back for wireless charging. The company said it was working on a new device, called the Airpad, that would charge all newer Apple products.

Arriving at the airport, Xi told reporters his three-day Hong Kong trip showcases the support for Hong Kong from the central government, which has offered its strong backing for the past 20 years.

Are they comfortable licensing out technology that is so crucial to their future to a Chinese company?

Argentina's capital needs to intensify its efforts to avoid overwhelming the healthcare system, something it has so far managed to do, he said.

Arianna Fishman, media secretary for the Department of Homeless Services, said the city authorities and the department's street action teams were monitoring Chinatown closely.