前后墙布置燃烧器
front and back wall fired burner
前后墙对冲锅炉
opposed wall firing boiler
前前后后算法
forward-backward algorithm
前后对比法
Before-after comparison method
前后对准
front to back registration
前后置处理系统
Pre processing and postprocessing system
胸前折皱位置,前8后51/2
waist ties shirring stitched down start position as pinned
治疗前后对比
contrast before and after treatment