And the rocks forming the trough, which poke aboveground only rarely, usually do so along nearly inaccessible tributaries and tend to be covered by dense vegetation.是什么意思_And the rocks forming the trough, which poke aboveground only rarely, usually do so along nearly inaccessible tributaries and tend to be covered by dense vegetation.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句