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  • Most COINS are made of alloys. Gold and silver, for instance, are usually alloyed with copper.

    大多硬币均由合金制造，比如黄金币和白银币通常含有一定的铜。

    youdao

  • Most COINS are made of alloys. Gold and silver, for instance, are usually alloyed with copper.

    大多硬币均由合金制造，比如黄金币和白银币通常含有一定的铜。

    youdao

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