Freestanding kivas discovered in the ruins of European-style missionary communities have been explained by some historians as examples of "superposition".
在欧洲风格的传教士社区废墟中发现的独立地下礼堂被一些历史学家解释为“叠加”的例子。
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A Moscow company is now marketing "Sleepboxes"—freestanding, mobile boxes with beds inside—for travelers stranded overnight, or those in need of a quick snooze.