Think about how you'd search a large room for a lost key. You wouldn't examine every square inch sequentially. You'd split the room into sections (by the couch, near the door, under the table) and rule out entire sections at a glance. "I didn't go near the kitchen, so skip that."
这叫“变工”，讲究人多力量大，也是一种在乡村社会里衍生出的互助生存模式。秋收后碾麦子和胡麻，逢年过节杀羊杀猪，还有红白喜事彼此帮忙办席。这样一来，不仅效率高，还有热火朝天的热闹气氛。
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