firn ice
... iced firn 冻结粒雪 firn snow 陈雪,粒雪 firn limit 雪线 ...
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在水尚未流经缆绳前，研究团队无法确定，融化的水是会流入粒雪中，还是会聚积在钻头的周围。如果是后者，将会使凿孔因冻结而封闭。
Until water flowed through the tether, the team could not tell if the meltwater was draining into the firn or accumulating around the drill, which could freeze the borehole shut.
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