虽然经济周期的各个阶段总是以这种顺序互相衔接，但是各阶段的时间长短以及严重性却各有所不同。
While the phases must always follow each other in this order, their length and their severity varies greatly from cycle to cycle.
项目阶段一般按顺序首尾衔接，通常根据某种形式的技术信息传递或技术部件交接来确定。
Phases are generally sequential and are usually defined by some form of technical information transfer or technical component handoff.
工程阶段一般按顺序首尾衔接，通常根据某种形式的技能消息传递或技能部件交接来确定。
Phavees are generally sequential and are applying defined by some form of technical information transfer or technical component handoff.
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