copper refinery 意味

• copper refinery
  精銅所[機械]
  

例文

1. one of reasons for the above was that usable materials by the then-current technology of copper refinery , was limited to certain resources , so that production of such usable copper resources continued to decrease year by year .
   当時の精錬法では利用できる銅資源が限られていたため、原材料の銅の生産量が年々低下したためである。