At the end of 2019, there was a sudden outbreak of the Coronavirus
Disease 2019(COVID-19) in China, which, as it did across most of the
globe, went on to reach pandemic level, posing serious threats to public
life and health.During the ELPHER period, except for some
mainstay sectors that maintained the operation of ordinary human life
and society, most sectors, including traffic, construction, commerce, catering, tourism and industrial activities, were subjected to an extreme
or complete standstill (Huang et al., 2020; Sun et al., 2020; Li et al.,
2020; Zheng et al., 2020).In order to prevent the spread of COVID-19, a first-level
public health emergency response (ELPHER) was triggered throughout
China in January 2020.