1、The pencil lead is broken.
鉛筆芯斷了。

2、A discovery made from pencil lead is promising to change the future of the electronics industry.
科學(xué)家一項從鉛筆芯中作出的發(fā)現(xiàn)，勢必將改變電子產(chǎn)業(yè)的未來。

3、Do you think pencil lead will wash out of this white shirt?
你認為鉛筆痕能從這件白襯衫上洗去嗎？