Zhè / kuài / huǒ / shān / yán / biǎo / miàn / cū / cāo / lǐ / miàn / yǒu / xǔ / duō / xiǎo / kǒng

这块火山岩表面粗糙，里面有许多小孔。

The surface of this volcanic rock is rough, with many small holes inside.