copper junk

例句：

1. 1. The scrap metal from the old car was worth a lot of money.
   旧车中的废金属价值不菲。
2. 2. The factory produces copper junk for the electronics industry.
   这家工厂为电子行业生产铜废料。
3. 3. The recycling center is collecting copper junk to recycle them into new products.
   回收中心正在收集铜废料以回收再利用。