1. N-COUNT/N-IN-NAMES A sierra is a range of mountains with jagged peaks. 層巒疊嶂的山脈[美國英語]

...the remote sierras of the south. ...南方遙遠的層巒疊嶂的大山。

...a bustling commercial centre in the Sierra Madre. ...一個位于馬德嶺群山中的熱鬧的商業(yè)中心。