It is not just a simple decision, although making that initial decision is hard enough.
这不是一个简单的决定，尽管最初做决定时已经够艰难了。
The system model consists of three levels, including initial planning, decision making and detail planning.
系统模型由三个层次组成，即初步规划层，决策层和详细规划层。
The system model consists of three levels, including initial planning, decision making and detail planning.
系统模型由三个层次组成，即初步规划层，决策层和详细规划层。
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