survey of existing line；survey of existing railway
Arid Ecology Environment Institute of Xinjiang University Resources and Environment College
Abundant existing species
access existing permanent file
according to existing law
account the existing infrastructure
adding extra-floor spanning existing building with steel structure
adding extra-floors spanning existing building
Adding storeys around existing buildings
additions to existing product lines
冷热电三联供系统（CCHP）
冷热电联供系统
热电冷联产(CCHP)
现有产品线的增加
Adjacent to Existing Line
advantages and existing problems
Already-existing Depletion Region
analysis of existing circumstance
analysis of existing condition