Images of the Beijing Olympic's giant 'bubble' that stretches nearly 200 kilometres (120 miles) and will cocoon thousands of people in an effort to thwart the coronavirus. China, where the virus emerged toward the end of 2019, has pursued a zero-tolerance strategy on Covid-19 and is taking the same approach to limit the pandemic's potential impact on the February 4-20 Winter Olympics and subsequent Paralympics. IMAGES FROM OUTSIDE THE CLOSED LOOP