生产一辆汽车的成本非常可观，并且汽车制造商投入了大量的资源来为他们试图生产的汽车模型设计合适的生产线。
The cost of manufacturing a car is substantial and automobile manufacturers spend a significant amount of resources designing the appropriate line for the model of car they are trying to produce.
在本例中，处理了两个选择框：一个包含汽车制造商，另一个包含汽车模型。
In this case, you're acting on two select boxes: one that contains car makes and one that contains car models.
而制造模型则经常是从硬纸板、塑胶或是汽车模型填充料开始。
Working models are often built from cardboard or plastics or car body filler.
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