surface key bed 地表基准层
pyroclastic key bed 火成碎屑物键层
Event key bed 事件标志层
Key bed method 标志层法
key bed of frozen earth 冻土标志层
key petroleum source bed 标准生油层
bed key 床钥匙
key y bed 标准层 ; 标志层
以上来源于: WordNet
At the section with non lithology key bed, the key bed could be selected according to the lithology combination and the particle variation.
在无岩性标志层的层段，则根据岩性组合及粒度变化选择标志层。
Later in the paper, a correlation between the main coal-seams in this province is made, in combination with the traditional method of the key bed, coal petrography and palaeontology.
然后，结合传统的标志层法、煤岩学及古生物学方法，对该区主要煤层进行对比。
I heard the key turn in the front door and I was out of bed like a shot.
我听见钥匙开前门的声音，立刻从床上起来了。
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