Vugular pore openings are frequently as large as an ordinary lead pencil and are usually attributed to leaching of the rock subsequent to deposition.
空孔穴开孔通常与一支普通的铅笔一样粗,这是由于沉积后巖石的侵析作用造成的。
The lead pencil is one of the most used pieces of merchandise in the world. It is the simplest, most convenient and least expensive of all writing instruments.
铅笔是这个世界上使用的最多的商品之一。在所有的书写工具中,它最简单,最方便,最便宜。
Pieces of bread were used to erase lead pencil before rubber came into use.
在橡皮擦使用之前,人们用一片面包来擦铅笔字。
The lead pencil is one of the most used pieces of merchandise in the world.
铅笔是这个世界上使用的最多的商品之一。在所有的书写工具中,它最简单,最方便,最便宜。
Perhaps the most surprising thing about the lead pencil is that it is not lead at all. And it is not a pencil.