最終更新日：2024/08/06
(mining) A smooth cylindrical piece of petrified wood in the ceiling of a mine which may drop down and injure or kill miners
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kettle bottom
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(mining) A smooth cylindrical piece of petrified wood in the ceiling of a mine which may drop down and injure or kill miners
kettle bottom
DiQt（ディクト）
無料
★★★★★★★★★★
