软弱下卧层
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Underlying weak layer 底层薄弱层
weak underlying layer
弱底层
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Essentially, they isolated a rectangular column from the surrounding snowpack and used a snow saw to start an artificial fracture by cutting through the weak underlying frost layer, then watched what happened.
MSN: How a deadly avalanche can be triggered
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