单语范例（未经PONS编辑处理）
Most of the mountainous islands are covered in tropical rainforest and volcanic in origin.
en.wikipedia.org The remainder is steep to mountainous, rising progressively to elevations above.
en.wikipedia.org Many of those cut off are in the mountainous northwest, where roads and bridges have been swept away.
en.wikipedia.org The reservoir is situated in a sparsely populated, mountainous area.
en.wikipedia.org The island is mostly mountainous, especially in the central and western parts.
en.wikipedia.org