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单词
floor sill
释义
floor sill
floor sill
[
′flōr ‚sil
]
(mining engineering)
A large timber laid flat on the ground or in a level, shallow ditch, to which are fastened the drill-platform boards or planking, or which is used as the base for a full timber set.
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更新时间:2024/9/23 9:24:46