以下为句子列表：
英文: Pieces of bread were used to erase lead pencil before rubber came into use.
中文: 在橡皮擦使用之前，人们用一片面包来擦铅笔字。
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英文: 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.
中文: 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。
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英文: Vugular pore openings are frequently as large as an ordinary lead pencil and are usually attributed to leaching of the rock subsequent to deposition.
中文: 空孔穴开孔通常与一支普通的铅笔一样粗，这是由于沉积后岩石的侵析作用造成的。
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