... pelagic deposit 远洋沉积 pelagic region 浮游区 pelagic trawl 上层拖网,浮拖网...
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The radiolarian cherts in the Wenbei region of Shaanxi Province are a formation of pelagic sediments formed within the North China Platform.
渭北奥陶系的放射虫燧石岩是在稳定的华北地台上形成的远洋沉积。
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