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to phrases
swallow hole
desert. 石灰坑; 灰岩坑
dril. 落水洞
el. 石灰岩渗水坑【地质】
eng.geol. 岩溶坑; 陷落坑
oil 陷落洞
tech. 渗坑
swallow-hole ['swɔləuhəul]
soil. 石灰坑
swallow hole: 5 phrases in 3 subjects
Engineering geology2
Oil / petroleum2
Technology1

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