3 篇文章
was used to burrowing underground
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was used to burrowing underground 习惯于在地下挖洞

Are merging together and burrowing through the surface.
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Are merging together and burrowing through the surface. 汇集在一起 在冰面钻出洞穴

burrowing up to a metre beneath the rocks.
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burrowing up to a metre beneath the rocks. 蛋藏在岩石下的深达1米的缝隙里

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