White mouthfuls of casting iron's gentle-treatment is a important craft to make farm implements.

白口铸铁的柔化处理就是制造农具的重要工艺。

youdao

White mouthfuls of casting iron's gentle-treatment is a important craft to make farm implements.

白口铸铁的柔化处理就是制造农具的重要工艺。

youdao