... backscratcher长柄扒 backscratching互相利用 backseat后座 ...
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A so-called “backscratching” principle was rather popular between factories and collective farms. So they preserved different vegetables for winter.
这段意思不对吧，原文是说这些工厂农场什么的都知道互相帮助，所以各单位冬天腌的菜都不同然后大家换着吃。
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