µå¹É±ä ÇÏÁö¸¸ Àß ¾Ë·ÁÁø 'Fallstreak Hole'À̶õ ±â»óÇö»óÀÌ´Ù.
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forms from droplets in the cloud that are below freezing, but haven't yet frozen.
"These 'supercooled' water droplets need a 'reason' to freeze, which usually comes in the form of ice crystals. Planes passing through the cloud layer can bring these ice crystals. Once the ice crystals are introduced, the water droplets quickly freeze, grow and start to fall. A hole is left behind, which will start to expand outward as neighboring droplets start to freeze."
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