- a bound copy of a document kept on file
- 底层: 1.(一楼) [英国] ground floor; [美国] first floor2.(地下室) basement3.(社会最低阶层) bottom; the lowest rung 在社会的最底层 at the bottom of society4.undercourse (垫层); base course (基层); subcoat (基础涂层); substratum (基层; 胶层); sublayer (层流底层)
- 底侧饰面: corner facets
- 底层;层理: bedding
- 底侧梁角支撑: bottom side rail angle
- 底层;地窖;基层: basement (l02)
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