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But epidemiologists and medical professionals point to what they say is overwhelming evidence from around the world, including China, that social distancing and closing businesses are effective and must continue longer than two weeks, when the virus is expected to peak, according to an adviser to the US Centers for Disease Control and Prevention (CDC).

But it’s also clear that sometimes AWS is just trying to send a message to employees thinking about leaving. People familiar with its employment tactics suggest it’s more aggressive than its fellow Seattle-area tech companies, some of whom don’t even force employees to sign non-competes, even though they can. (Amazon representatives did not respond to a request for comment on this story.)

But assisting the migration is only part of the battle, they also need to increase fertilization rates, The success rate for natural fertilization is extremely low, as the sperm of male carp can only survive for 20 seconds in the water, said Zhou Weiguo from the carp rescue center.

But low wages are not the only thing that matters. Fitch said only those offering a workable business environment and relative macroeconomic and political stability can make the most of opportunities stemming from the shift in China's development strategy.

But for National Immigration Administration officers at the local border control station, the very things that draw people to Beiji-literately "north pole" in Mandarin-are the biggest obstacles to keeping their 2,798-square-kilometer stretch of the 173-kilometer border with Russia free from trouble.