1. After experiment, we made a lot initial clinical applications and got ideal macadam effect. 并在此基础上进行了初步的临床应用，获得了理想的碎石效果。
2. Next moment his nose was buried in the macadam and his right knee was out through his torn garment. 不一会儿，他在碎石路上跌了个狗吃屎，裤子撕破，露出了右腿的膝盖。
3. It's sunday today. Without taking photos yesterday, great changes could be seen today: bituminous macadam was paved already. 星期日，就差昨天没拍，今天就看到了翻天覆地的变化：柏油路面已经铺上了。
英英解释
n.
1. broken stone used in macadamized roadways
2. a paved surface having compressed layers of broken rocks held together with tar
