阿巴拉契亚山脉是北美洲东部的主要山脉。
Appalachian Mountains are an important mountain range in eastern North America.
济州岛上的主要山脉是汉拿山，汉拿山为一座火山堆，在1007年喷发。
Cheju Island is the main mountain-Mt Han Mt heap for a volcano in the 1007 eruption.
因为商队只能通过水路和山脉进入沙漠，贸易就成为了中东城市的主要经济支柱。
Trade was the mainstay of the urban economy in the Middle East, as caravans negotiated the surrounding desert, restricted only by access to water and by mountain ranges.
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