pencil lead
常见例句
- Layers of graphene make up the graphite found in pencil lead.
鉛筆芯裡的石墨就是由多層石墨烯組成的。 - A discovery made from pencil lead is promising to change the future of the electronics industry.
科學家一項從鉛筆芯中作出的發現，勢必將改變電子産業的未來。 - 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.
令他喫驚的是，他發現蠟燭裡的碳已經形成了純碳的四種形態，包括：鑽石、石墨和鉛筆芯。 - 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