The feature of the source bed is the essential condition for the formation of gold deposits of cer-tain types.

矿源层是某些类型金矿成矿的必要条件之一。

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The feature of the source bed is the essential condition for the formation of gold deposits of cer-tain types.

矿源层是某些类型金矿成矿的必要条件之一。

youdao