Under normal conditions, rocks composed of clay produce far less friction than do other rock types.
在正常情况下，由粘土组成的岩石产生的摩擦要比其他类型的岩石小得多。
In the 20th century, the first four notes were used by other musicians to make different types of music like hiphop and rock and roll.
在20世纪，其他音乐家会使用前四个音符创作不同类型的音乐，如说唱乐和摇滚乐。
This stone is actually quite rare and difficult to cut, so in many cases other types of rock were used as substitutes, for example green feldspar, basalt, and serpentine.
这个石头实际上相当稀罕和难于切割，因此在许多情形里其它类型岩石被当作代用品使用，例如绿长石，玄武岩和蛇纹石。
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