fungible

这些标准化的零件是完全可互换的，可以随意替换使用。

These standardized parts are ___fungible and can be replaced interchangeably.

黄金是高度可替代的商品，因为一盎司黄金可以轻易被另一盎司黄金替代。

Gold is a highly ___fungible asset, as one ounce can be easily replaced by another ounce of the same purity.