The transition from forest to treeless tundra on a mountain slope is often a dramatic one.
从森林到山坡上没有树木的苔原的过渡通常会十分突然和明显。
The plain-furred Pallas's cat melts into the treeless steppes of central Asia, while the small Andean mountain cat has a silver-grey coat that matches the rocky landscape.
素色的雅典娜的猫可以溶入中亚荒脊的草原里而小安第斯同猫长有银灰色的皮毛，这种颜色与多石的地貌色很好地溶合在一起。
But the zone is largely treeless, studded with house-size rocky chunks, called hummocks, that broke off the top of the mountain when it exploded.
然而这个区域还是基本上光秃秃的，布满了房子般大小的岩石块，形成一个个的小山岗，这些都是火山喷发的时候从山顶滚落下来的。
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