a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt.
喷发熔化的火山岩和气体的地球外壳(或是其他行星的表面)的裂缝。
Violent crust movements always happen near the continental shelf.
陆坡区域的地壳经常出现剧烈的活动。
Ice crusted the lake last night.
湖面上昨夜结了一层冰。
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