pencil lead

常見例句

Layers of graphene make up the graphite found in pencil lead.
鉛筆芯里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(xué)家一項(xiàng)從鉛筆芯中作出的發(fā)現(xiàn)，勢(shì)必將改變電子產(chǎn)業(yè)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.
令他吃驚的是，他發(fā)現(xiàn)蠟燭里的碳已經(jīng)形成了純碳的四種形態(tài)，包括：鉆石、石墨和鉛筆芯。

Each day he dotted the virtues he failed to fulfill with a black lead pencil.
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An analogy: think of a pencil, where the lead in the middle is the cellulose fiber, surrounded by unwanted lignin and hemicellulose.
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Later versions would sandwich the lead between two pencil halves and glue them together.
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