source- bed

• 矿源层

source- bed的用法和样例：

例句

1. Source beds are turbidite of middle Triassic series.
   矿源层为中三叠统浊积岩。
2. The Jingshan and Jiaodong Groups metamorphic green formation is the source bed of the gold mineralization in this region.
   区内荆山群和胶东群变质绿岩建造是金矿化的矿源层。