Typically, cement plants use coal or petroleum coke or natural gas to heat the kiln to 1450 degrees Celsius.

通常，水泥厂使用煤或石油焦或天然气将窑加热到 1450 摄氏度。

The final piece of the battery puzzle came from the lab of Akira Yoshino in Japan, who found that lithium ions could also slip in and out of petroleum coke, a carbon-rich material derived from oil refining.

电池的最后难题在日本吉野彰的实验室得到解决，他发现锂原子同样可以自由出入于石油焦，一种从石油中提炼出来的富碳物质。