Terms for subject Space containing need

English	Chinese
launch on need	按需发射
mission element need statement	任务要素需求说明书
need and planning document	需求与计划书
need and planning documents	需求与计划书
routine launch on need	按需例行发射
statement of operational need	使用需求声明书 (美国，采购军用品时由军方提出的)
urgent launch on need	紧急按需发射