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der Stollen
☊
hầm
☊
☊
Stollen
☊
矿坑
☊
kuàngkēng
der Stollen ☊ 
hầm ☊ 
☊ Stollen ☊ 矿坑 ☊ kuàngkēng der Stollen ☊ hầm ☊ ☊ Stollen ☊ 矿坑 ☊ kuàngkēng