annually frozen layer
... annually frozen layer年冻结层 annually balanced budget年度平衡预算 annually balanced budget年度平衡预算 ...
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2000年，他曾用柱体容器从乞力马扎罗山的冰川层深部提取了部分冰块，发现冰块上层充满了细长的气泡，证明在最近那几年冰层曾今融化并重新冻结。
In 2000 he extracted deep cylinders of ice from Kilimanjaro's glaciers and found that the higher layers were full of elongated bubbles - signs that melting and refreezing had occurred in recent years.
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