经济极限采购收率, 经济极限开采量的英文

economic ultimate recovery

• 经济:    economy
• 极限:    the limit; the max ...
• 采购:    make purchases for ...
• 收:    put away; take in
• 率:    rate; ratio; propo ...
• 开采:    mine; extract; exp ...
• 量:    measure capacity