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。

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Bumping rubber: protect the item from hitting to lead a scratch and also less noise;

碰撞橡胶套：保护机器碰撞时造成的划痕；

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Bumping rubber: protect the item from hitting to lead a scratch and also less noise;

碰撞橡胶套：保护机器碰撞时造成的划痕；

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