At first, I thought they were bomb-shlter curtains, designed to keep out the shrapnel, incendiaries and worse. (Ever seen a radiologist's apron?) When I frist came to Dalian, I had a colleague who insisted that the reason DL had so many underground shopping malls is that they were all initially designed for civil defense. Yeah, you are somewhat protected from the, umm, elements down there.
In my neighborhood, they think I'm crazy because I buy (and drink) the cold beer stacked outside the shop instead of taking the warm ones inside.
hotpot: definitely one of the good things about dong-bei winters. (not to mention getting half blitzed on baijiu at lunch and snoozing half the afternoon away on the kang with the daughter while the wife visits and gossips)