Success of the Subway, what is the 5 reason. Answer with Chinese translation

Despite a slowdown in global fast-food consumption, Subway continues to be a success story. Justify 5 reasons for its success? 
尽管全球快餐消费放缓，赛百味仍然是一个成功的故事。 证明其成功的 5 个理由？

unique business operation model

• Subway has made a unique business operation model, which shows the making process in Infront of the consumer that provides trust and credibility to the consumer. 

赛百味打造了独特的商业运营模式，将盈方的制作过程展现在消费者面前，为消费者提供信任和信任。

brand characteristics

• Subway has different brand characteristics compared with other fast-food restaurants that focus more on health and customization food that actually differentiate Subway from other fast-food restaurants.

赛百味与其他快餐店相比具有不同的品牌特征，这些快餐店更注重健康和定制食品，这实际上是赛百味与其他快餐店的区别。

entry mode

• Subway has used the appropriate entry mode to enter the market, which is franchising, also that subway initially lower franchise fees which helps the subway grow faster.

地铁采用合适的进入模式进入市场，即特许经营，也就是地铁初期较低的特许经营费，帮助地铁更快发展。

product type

• High potential of product type provides consumer variety of solving and allows product customization. 

产品类型的高潜力为消费者提供多种解决方案并允许产品定制。

ingredient freshness

• Subway always tries to maintain its ingredient freshness, which enhances the user impression about health to obtain credibility and preference from consumers.

赛百味始终努力保持其成分的新鲜度，从而增强用户对健康的印象，从而获得消费者的信任和偏好。