模型还可能包括环境因素，比如宏观经济增长统计，竞争和规则需求，定价(折扣)，等等，它们将影响价值。
The model may also include contextual factors, such as macroeconomic growth statistics, competitive and regulatory requirements, pricing (discounts), and so on, that will affect the value.
首先，重点研究了影响老虎航空的宏观环境因素。
Firstly, it is focused on the macro environmental factors affecting Tiger Airways.
但是，铁路运输作为一个复杂的动态系统，其运行受到多种因素共同作用，其中最显著的影响来自国民经济宏观环境。
But the railway transportation system is a complex dynamic system affected by many factors in which the most important influence factor is national economy macro-environment.
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