After half a year of patient experimentation, Yang finally came up with what is now known as the "rubberized asphalt concrete" (RAC) track.
第二天，無意中踏到已經冷卻的凝固體，發現這一物體堅固又有彈性，於是聯想到，或許可以運用在田徑跑道上。又做了半年的實驗，他終於發明瞭這種以廢橡膠輪胎與瀝青混合的混凝土。