The other is synthetic, coming from the roasting of so-called needle coke, a by-product created in some coal-processing and petrochemical plants.

另一种是合成的， 来自所谓的针状焦的焙烧，针状焦是一些煤炭加工和石化工厂产生的副产品。

Although graphite can also be mined, most of it is currently produced in a synthetic form by roasting needle coke, a by-product of some coal-processing and petrochemical plants.

虽然石墨也可以开采，但目前大部分石墨是通过焙烧针状焦（一些煤炭加工厂和石化工厂的副产品）以合成形式生产的。