The food yield per unit water is an important index, which indicate the efficiency of the irrigation water use and status of food production.
单位水量粮食生产能力是综合反映灌溉用水水平和粮食生产状况的重要指标。
The backtracking unit can deduce the index value of the status element with the minimum path weight at a stage according to the register configuration of all the processing hierarchies.
该回溯单元可根据所有处理层级的暂存器配置推导出一阶段中路径权值最小的状态元的索引值。
The bone mineral density (BMD) means the bony mineral quantity per unit area, which is an important index reflecting the metabolic status of the skeleton of human being.
骨密度是指骨单位面积所含的骨矿物量，它是反映人体骨骼代谢状况的一项重要指标。
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