The stamp mill is closely related to the recovery of gold by amalgamation, a process now obsolete.

捣碎机与现在已经不使用的汞齐法选金密切相关。

youdao

The stamp mill is closely related to the recovery of gold by amalgamation, a process now obsolete.

捣碎机与现在已经不使用的汞齐法选金密切相关。

youdao