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Apple also introduced the iPhone 8 and the iPhone 8 Plus, which resemble the iPhone 7 line but have a glass back for wireless charging.
Artificial intelligence will play an important part in areas such as education, medical care, and in creating jobs, he said.
Around 1,300 competitors participated in more than 50 events this year. China sent the largest-ever delegation - 52 members - ranging in age from 18 to 21. It was the first time that China participated in 18 of the events.
Around 8.4 million Chinese college graduates are expected to enter the job market this year, and many are worried about their job prospects.
Argentina registered its first case of COVID-19 on March 3 and has to date reported 1,262,476 confirmed cases of infection and 34,183 deaths from the disease.
