例句 /

After providing a definition of opportunity cost, I use this concept to examine how fertilizer should be allocated among different crops, and how fertilizer expenditures should be allocated among different fertilizers.

After providing a definition of opportunity cost, I use this concept to examine how fertilizer should be allocated among different crops, and how fertilizer expenditures should be allocated among different fertilizers.

首先,我要给机会成本下个定义,然后再用这一概念来分析怎样在不同作物之间对肥料进行分配,以及怎样在不同肥料之间对资金进行分配。