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。
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.
这座高达2582米（9357英尺）的成层火山（百科看 这里——译注）顶部被一层30平方公里的冰川（10平方英里）所覆盖，大部分冰雪都积聚在山顶南部和东部因岩浆喷发所形成的盆地中。
The 2,582-meter (9,357-foot) stratovolcano is mantled by a 30-square-kilometer (10-square-mile) glacier field, most of it amassed south and east of the summit in a basin made by a caldera depression.
自火山喷发以来，纳布诺火山的山顶一直被大量的水蒸气，气体及火山灰所遮盖。
Since the beginning of the recent eruption, a dense plume of water vapor, gas, and ash has concealed the summit of the Nabro volcano.
远处山顶上升起的烟羽似乎在提醒这里的居民不要忘记另一重威胁：火山喷发。
The plume rising from the mountain reminds residents of yet another threat: eruption.
山顶有小圆形火山口，直径大约1千米，周围是80到300米高的墙（喷发岩形成的）。
A small circular caldera crowns the volcano. A little more than a kilometer across, the caldera is defined by walls that range from 80 to 300 meters high.
阿拉斯加，蒸汽从山顶上的火山口喷发。
Alaska - Steam rises from the top vent in the summit crater of Mount Redoubt.
阿拉斯加，蒸汽从山顶上的火山口喷发。
Alaska - Steam rises from the top vent in the summit crater of Mount Redoubt.
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