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Bike-sharing services took off in Chinese cities in the past two years. They allows riders to hire bikes for about one yuan (about 15 U.S. cents) per hour via a mobile app, and drop them off for the next user.

Both male patients, aged 39 and 56, had been to Wuhan within the past week. They have been put in quarantine at Princess Margaret Hospital in northwestern Kowloon.

Bolsonaro has said he will consider accepting the aid if Macron apologizes for calling him a "liar" and retracts remarks about the internationalization of the Amazon jungle.

Bolsonaro, 63, said he planned to govern "following the teachings of God, alongside the Brazilian constitution and with good technical advice, without political leanings."

Blockchain's hallmark is decentralization. Data can be shared among a distributed network of computers with no need for middlemen. After being recorded in a blockchain-based ledger, data can't be altered.