The fifth part is focusing on a few key stages in the model: career preparation stage, career shaped stage, career stabilization stage and career recession stage;
⑤着重阐述模型的几个重要阶段：职业准备阶段、职业塑造阶段、职业稳定阶段以及职业衰退阶段；
Therefore, it may be concluded that control of aerobic reaction ending at nitrosation stage is the key to the maintenance and stabilization of short-cut nitrification.
因此可以得出，好氧反应时间的控制在亚硝化阶段基本结束时是维持并稳定短程硝化的关键。
According to laser working process, stabilization frequency includes mode hopping, transition stage and stabilized mode.
按照激光器的工作过程，稳频分为三个阶段：跳模、过渡阶段，模式稳定。
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