left inside backward edge 左脚向后内刃
right inside backward edge 右脚向后内刃
left outside backward edge 左脚向后外刃
right outside backward edge 右脚向后外刃
Spin Edge Backward 向后旋转边
Operations are stupid and don't understand the new hotness - why can't they implement the cutting edge technology? Why are they so backward?
运维部门比较笨，他们不懂新技术——为什么他们没法实现最新的技术呢？为什么他们这么落伍呢？
Each edge is actually stored twice: once in the "forward" direction (indexed and partitioned by the source ID) and once in the "backward" direction (indexed and partitioned by the destination ID).
图的每一条边都被存储了两次：一次正向存储(根据源id做索引和分块)，一次反向存储(根据目的ID做索引和分块)。
The economy of distressed backward areas has been operated in substituting labor force on the long edge for capital (and technology) on the short edge and over exploiting land resources to the utmost.
贫困落后地区的经济运行是以劳动力长边最大限度地替代资本（技术）短边，超强度地开发土地资源维系的。
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