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But this is no easy task. Most of the endangered languages are scattered in remote or mountainous areas that are difficult to access. Also, many of them are only spoken by a handful of people, making it almost impossible to record the language.

By 2015, it had grown into a renowned organization consisting of about 30 regular dancers, almost all of whom are retirees in their fifties and sixties.

But there are some economic indicators that have yet to return to anything approaching normal levels. The surveyed unemployment rate in urban areas is still high. And the year-on-year overall growth rates of investment and consumption have not yet returned to positive growth.

But the grilling got more intense, and personal, Tuesday afternoon when Downing pressed Gates about a "secret life" he said was funded by embezzlement, including an extramarital affair that Gates himself acknowledged. Gates also said he may have submitted personal expenses for reimbursement by Trump's inaugural committee, which he helped operate.

But the intermediate host is only one piece of the puzzle. Locating the actual viral origin is so difficult that it wasn't until 2016 that Chinese scientists said they had traced the natural carrier of the SARS virus to horseshoe bats in a cave from Yunnan province. Shi said scientists might need to do the same time-consuming field work to find the source for the new virus.