打底子 meaning in English
1.(起草) sketch (a plan, picture, etc.)
2.(奠定基础) lay a foundation
Examples
- Specification for mortar for masonry - rendering and plastering mortar
圬工砂浆规范.打底子灰和抹灰用砂浆 - Specification for mortar for masonry - part 1 : rendering and plastering mortar ; german version en 998 - 1 : 2003
砌体用砂浆规范.第1部分:打底子灰和抹灰用砂浆