These unobtrusive lumps of rock-hard substance are, surprisingly enough, Yang Ch'un-lin's 1986 International Geneva Inventions Exposition bronze-medal-winning invention. A compound made of used latex tires and asphalt, the substance, for which he has been awarded a fifteen-year patent, is used for surfacing athletic running tracks.
這幾塊不起眼的硬塊，竟然就是楊春霖混合廢橡膠輪胎與瀝青，研究出來的田徑跑道材料。這項發明，取得了十五年的專利；在一九八六年日內瓦國際發明展中，也榮獲銅牌獎。