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背：离开；井：古制八家为井，引伸为乡里，家宅。离开家乡到外地。
[flee one's home;tear oneself away from one’s native place; turn one's back on one's native land and leave it] 离开家乡去谋生 大批农民离乡背井,去寻找新的肥沃土地
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