除此之外，它还涉足石油下游活动。
这意味着，对于fork的每个分支，merge都将执行并触发流程模型中的下游活动。
This means, for each branch of the fork, the merge executes and triggers the activities further downstream in the process model.
围绕样机模型，在设计阶段就考虑装配、制造等下游活动所涉及的所有环节和因素。
Centering on the model of cyclotron prototype, we consider all links and factors that the activity of lower reaches such as assembling, manufacturing etc involves on design phase.
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