pencil lead
常见例句
- Layers of graphene make up the graphite found in pencil lead.
铅笔芯里的石墨就是由多层石墨烯组成的。 - A discovery made from pencil lead is promising to change the future of the electronics industry.
科学家一项从铅笔芯中作出的发现，势必将改变电子产业的未来。 - To his surprise, he discovered that the carbon in the candle wax had formed all four types of pure carbon, including diamonds and graphite, or pencil lead.
令他吃惊的是，他发现蜡烛里的碳已经形成了纯碳的四种形态，包括：钻石、石墨和铅笔芯。 - Each day he dotted the virtues he failed to fulfill with a black lead pencil.
FORBES: On The Cover/Top Stories - An analogy: think of a pencil, where the lead in the middle is the cellulose fiber, surrounded by unwanted lignin and hemicellulose.
FORBES: Ethanol - Later versions would sandwich the lead between two pencil halves and glue them together.
FORBES: Magazine Article 返回 pencil lead