1、They yare made from different materials — dolomite, tough silk, organdie etc.
它們是用不同的材料做的，白云石、綃、蟬翼紗等。

2、They are made from different materials — dolomite, tough silk, organdie etc.
它們是用不同的材料做的，白云石、綃、蟬翼紗等。

3、They are made from different materials??dolomite, tough silk, organdie etc.
它們是用不同的材料做的，白云石、綃、蟬翼紗等。

4、They are made from different materials——dolomite, tough silk, organdie etc.
它們是用不同的材料做的，白云石、綃、蟬翼紗等。