One theory is that the wheels of vehicles in heavy traffic on the day after Thanksgiving day left many black markings on the road surface, leading to the term black Friday.
其中一种说法是感恩节之后这一天拥挤的交通会使车轮在路面留下很多黑色痕迹，就有了“黑色星期五”这个说法。
In the past, white carbon black in the tire is to increase the tire's performance, especially in winter tires and tires on the wet road surface to enhance the holding capacity.
过去，白炭黑在轮胎中的应用主要是为了提高轮胎的性能，特别是冬季轮胎以及增强轮胎在湿路地面的抓着能力。
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