ice-fall

n very steep part of a glacier, like a frozen waterfall 冰川的陡峭部分（状如结成冰的瀑布）.

ibex, ibidem, ibis, IBM, ICBM, ice, ice age, ice cream, ice crevasse, ice dancing, ice hockey (US hockey), ice lolly (US Popsicle), ice-axe (also esp US ice-ax), ice-blue, ice-bound, ice-breaker, ice-cap, ice-cold, ice-cream, ice-cube, ice-field, ice-floe, ice-free, ice-pack, ice-pick, ice-rink, ice-show, ice-skate, ice-skating, ice-tray, ice-water, iceberg, icebox, Iceland, ichneumon, ichthyologist, ICI, icicle, icily, iciness,