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单词 bottom bed
释义

Definition of bottom bed in English:

bottom bed

noun

  • (A name for) the rock stratum which is the lowest that is generally worked in the quarries of a particular district; (more widely) the lowest stratum of a rock formation.

Origin

Early 19th century.

 
 

Definition of bottom bed in US English:

bottom bed

noun

  • (A name for) the rock stratum which is the lowest that is generally worked in the quarries of a particular district; (more widely) the lowest stratum of a rock formation.

Origin

Early 19th century.

 
 
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更新时间：2026/6/6 4:16:16