source- bed的用法和樣例:
例句
- Source beds are turbidite of middle Triassic series.
礦源層為中三疊統濁積岩。
- The Jingshan and Jiaodong Groups metamorphic green formation is the source bed of the gold mineralization in this region.
區內荊山群和膠東群變質綠岩建造是金礦化的礦源層。
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