然而，汽车却让这一具有悠久历史的自行车文化面临着严峻而紧迫的威胁。
But a long thriving two-wheeled culture faces a grave and imminent threat from cars.
中国的自行车文化源远流长，但是如何改变人们对自行车的传统定义-代步工具呢？
China's bicycle culture has a long history, but how to change people's traditional definition of the bicycle transport?
中国的自行车文化正面临着汽车的威胁。与此同时，美国却在试图激发起人们对于自行车的热爱。
While China's thriving bike culture is threatened by cars, the US is trying to inspire passion for cycling.
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