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"For instance, if a tenant violates the contract, what can we do without the constraint of the deposit?" Wang said.

"Having meals gives me life, but eating snacks brings me joy," said Xu Shuyang, a graduate student at Tianjin University.

"Given our preliminary understanding that there has been limited contact tracing performed to date, there may be other staff and residents at risk for exposure to COVID positive individuals," the health agencies said in a letter released on Thursday.

"Filling an academic gap, it will greatly help us figure out the evolution of human beings in East Asia and the origins of modern humans," Zhang Dongju, a professor from Lanzhou University in Gansu province and a leading scientist of the program, said at a meeting organized by the National Cultural Heritage Administration in Beijing on Friday.

"For Beijing's new immigrants, the city is a distant place where they can't stay; for its old residents, it is an old home they can't return to."