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The lake has frozen over.
湖面已封冻了。
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When the river freezes over, we can walk across on the ice.
河流结冻时, 我们可以踏冰穿过河面。
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This cold wave is severe enough to freeze over all the rivers and ponds.
这次寒潮很厉害, 河流和池塘都得结冰。
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The river was frozen over last night.
昨晚河水全冻结了。