They're made of a different type of rubber (compared to regular tyres), that doesn't become brittle when the temperature drops, and have deeper tread grooves that help vehicles grip the road better in the cold and ice.
它们由不同类型的橡胶制成(与普通轮胎相比),当温度下降时不会变脆,并且具有更深的胎面凹槽, 有助于车辆在寒冷和冰面上更好地抓地力。