词汇	per-unit cost
释义	per-unit cost 经单位成本
随便看	Ecology Party ecology person ecology philosophy idea ecology plan ecologyplanning ecology planning ecology planting ecology poetry Ecology policies select ecology politics ecology position situation theory ecology precedence ecology preservation ecology pressure ecology principle on plant ecology priority ecology problem ecology protection ecology protection structure ecology protects ecology province Ecology Public-spirited wood ecology public welfare forest ecology reads extensively the garden ecology realization degree