A shell splinter embedded itself in the wall above his head.
在他头上方的墙壁上嵌有一块小小的贝壳片。
A remnant or trace of an organism of a past geologic age, such as a skeleton or leaf imprint, embedded and preserved in the earth's crust.
化石埋置并保存于地层中的古生物遗体、遗物和其生活遗址，如骨骸、叶子的印痕等
