This is the first in a series about China's plans to reopen its borders amid the Covid-19 pandemic. Here, Zhuang Pinghui and Simone McCarthy look into what it will take for China to reopen safely. When the coastal province of Fujian announced at the end of April it would cut the quarantine required for some Taiwanese visitors, authorities hoped the example could test the water. The idea was to reduce the time in isolation from 14 days to just...