It was covered with tall trees and the swamp was a crystal-clear river.
那里覆盖着高大的树木，沼泽是一条清澈的河流。
The K18 coalbed was formed in a high position forest swamp covered by shallow water on the structure of estuary sediments and it was finally covered by estuary sediments.
K18煤层是河口湾沉积格架上形成于浅覆水高位森林沼泽之中，最终又被河口湾沉积所覆盖。
The K18 coalbed was formed in a high position forest swamp covered by shallow water on the structure of estuary sediments and it was finally covered by estuary sediments.
K18煤层是河口湾沉积格架上形成于浅覆水高位森林沼泽之中，最终又被河口湾沉积所覆盖。
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