大量冰块从高山上崩裂下来的现象icefall

• 北坳地区坡度很陡，经常发生冰崩、雪崩。

  Bei’ao has a very precipitous topography, and there are often avalanches and icefalls.

• “快趴下，冰崩！”向导一声断喝，众人赶忙滚下牦牛在冰坎下卧倒。

  “Icefall! Get down!” the guide barked; and everyone tumbled off their yaks and lay underneath the ice ridge.