To have four full ice sheets is quite rare, "noted Simon."
西蒙说：“一个城市有四个冰场很少见的。”
Ice sheets are broad glaciers that blanket whole regions.
冰盖则是能把整个地区覆盖起来的广阔冰川。
Ice sheets are heavy, and when not supported, they crack off.
冰川十分厚重，而且当失去支撑时，它们就会破裂。
Ice sheets are heavy, and when not supported, they crack off.
冰川十分厚重，而且当失去支撑时，它们就会破裂。
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