key bed 标准层 ; 标志层 ; [计] 键座 ; [机] 键槽
key petroleum source bed 标准生油层
surface key bed 地表基准层
pyroclastic key bed 火成碎屑物键层
key y bed 标准层 ; 标志层
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
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。
He set this valise on a chair near his bed, and he always carried the key about his person.
他把提箱放在自己床边的一张椅子上，钥匙老揣在身上。
Going to bed early is key to getting enough sleep and helping adolescents feel on top of the world, a new study reported.
一项最新研究报告称，早睡不仅是得到充足睡眠的关键，而且有助于改善青少年的情绪。
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