We learned that naturally oxidized copper is avaluablematerial , an imperial hous ehold agency spokesman said . sowe areinquiring with artist associations to see if anyone elseisinterested in using them , rather than handing them toscrapvendors 一位皇宫发言人说: “我们得知自然氧化铜是一种有价值的材料… …于是我们和艺术家协会联系,看看有没有人对它感兴趣,这比交给废品收购者强。 ”