Why are car tires black?

【前思英语英文甜点分享】 今天是2019年11月6日，星期三，晚安 今晚分享：Why are car tires black? 汽车轮胎为什么是黑色的? Take a look at the cars driving down the street. What color are their tires? They are all black.Do you know why? 看一下沿街行驶的汽车。 他们的轮胎是什么颜色的？ 它们都是黑色的，你知道为什么吗？ Early car tires had a much lighter color.That's because they were made of natural rubber(天然橡胶）.Its color is off-white(灰白色）. 早期的汽车轮胎颜色浅得多。这是因为它们是天然橡胶（天然橡胶）。颜色是灰白色。 Later,people added carbon black(炭黑)to the tires.This makes tires look black. 后来人们在轮胎上加了碳黑，这使轮胎看起来很黑。 What does carbon black do? 碳黑是做什么的？ 1.It can block UVrays(紫外线).UV rays can make rubber crack(破裂）. 它能阻挡紫外线，紫外线能使橡胶破裂。 2.It makes tires more stable（稳定的）while driving. 它会使轮胎在驾驶中更加稳定 3.It makes tires strong. 它会使轮胎更结实 They take a longer time to wear down(磨损）. 它们需要更长的时间来磨损。 Old tires last for about 8,000 km.Tires with carbon black last for more than 80,000 km. 旧轮胎寿命约8000公里，炭黑轮胎约80000公里。 Colorful tires Michelin(米其林）is a French tire company.It made colorful car tires in1996.But the colorful tires distracted(分心）drivers.This could cause' car accidents. 彩色轮胎米其林是法国轮胎公司。这种彩色轮胎生产于1996年。但是这种彩色轮胎会使司机分心，这可能导致 “ 汽车 ”意外。 本期录音：前思英语 | 赵老师 【前思，陪你一起看世界】✈️ ✈️ ✈️