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Compared with traditional roofing alloy of aluminium, magnesium and manganese, a stainless steel roof welded as a whole is more stable and tolerant to windy weather. The roof is designed to withstand wind as strong as 60 meters per second, according to Cai.

Commemorative activities were held last week at Nelson Mandela Square in Sandton, Johannesburg, where a bronze, 6-meter-tall statute of the statesman stands.

Concerns are also rising among multinationals about to what extent the epidemic's impacts on supply chains would ripple from China to the rest of the world.

Cohen and her colleagues at TED hatched the idea before partnering with Audible to make it a reality.

Communication University of China said it has opened online admissions for 23 majors and directions. The school's expert teams are evaluating video works sent in by candidates online.