英语语法分析

Rocks like quartz, well, quartz of optical quality weren't cheap.

具有像石英这样的光学品质的石头并不便宜。

To this class of substance belong mica, porcelain, quartz, glass, wood, etc.

属于这类物质的有云母、瓷器、石英、玻璃、木材等等。

《新英汉大辞典》

Nearly all computers contain a quartz-crystal clock to regulate their operation.

几乎所有的计算机都有一个石英晶体时钟来调节它们的运行。