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Any hardware rollouts are years away, Dugan said in a speech. Potential products could, if successful, be a way for Facebook to diversify beyond its heavy reliance on advertising revenue.

Ant Financial, one of the first Chinese companies to develop the blockchain technology, made Forbes's Blockchain 50 list this year.

Another factor behind the strong China-Africa relationship is an emphasis on treating each other with equality.

Ankai's latest annual report released in March shows that it sold 8,718 buses in 2017, which was 14 percent less than the previous year. "But rapid growth was seen in exports in recent years, partly thanks to the Belt and Road Initiative," Dai said.

Anyone refusing to comply with self-isolation orders in NSW can be hit with fines or six-month prison.