A usually black or banded, hard volcanic glass that displays shiny, curved surfaces when fractured and is formed by rapid cooling of lava. 黑曜岩火山玻璃,一般为黑色,带状,摔碎时色泽光亮,表面变曲,由火山熔岩迅速凝而成
The fall fractured his skull. 这一跤把他的颅骨摔裂了。
His son suffered from a fractured pelvis. 他儿子出现骨盆骨折。