zhè / kuài / fěn / shā / yán / zhì / dì / xì / mì / shì / hé / yòng / lái / yán / jiū / dāng / dì / de / dì / zhì / biàn / huà

这块粉砂岩质地细密，适合用来研究当地的地质变化。

This siltstone has a fine texture and is suitable for studying local geological changes.