复数： quartzs

He gives the counter-example of a quartz crystal .

他给出了一个石英晶体的反例。

Both shatter cones and shocked quartz are considered strong evidence of meteorite impacts .

而震裂锥和冲击石英正是陨石撞击的强力证据。

Salt , snowflakes , and the quartz in your watch are all crystals .

盐、雪花和手表上的石英都是晶体。

It is mainly used for medium and fine crushing , especially in crushing iron ore and quartz stone .

它主要被用来进行中碎和细碎，尤其是在铁矿石和石英石的破碎过程中。

In their natural state , oil sands are made of quartz sand covered by layers of water and bitumen .

在自然状态下，油砂由石英砂构成，上面覆盖着多层的水和沥青。