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"Even if it is a headache for passengers to be unable to buy affordable return tickets, based on current information, there is no violation of regulations or laws in the sales of air tickets for flights leaving Hainan by the airlines," said Li.

"Economic history clearly shows that trade wars not only hurt global growth, but they are also unwinnable," said Lagarde.

"Early bond issuance will facilitate local governments' direct financing early enough to support capital expenditure," said Amanda Du, a senior analyst with Moody's Investors Service.

"Every time I express my belief that sex education should begin at primary school level, many of my friends are stunned, almost open mouthed. They say 'Oh, my goodness! How can we allow these innocent kids to learn about sex?'" said Li Ming, a sex education teacher at Xingzhi Primary School in the Beijing's Daxing district.

"Even for patients with rare diseases where therapies are available, standard family care is crucial to improving their quality of everyday life to the maximum, postponing disease development and extending life," said Ding Jie, vice-chairwoman of the Expert Committee of Diagnosis, Treatment and Security of Rare Diseases with the National Health Commission. Ding is also a professor of pediatrics at Peking University First Hospital.