metal可数吗Gold,silver and iron are all ____ .(metal)

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metal可数吗
Gold,silver and iron are all ____ .(metal)

填 metals.
metal 做【不同种,各种各样的金属】的时候是可数名词.用法与fish 相似.比如：There are three metals in the phone.
如果单纯指抽象的金属,那是不可数的.比如：The phone is made of metal.

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