你知道怎么制造橡皮吗？
B：To tell the truth, I don't know. But one thing is for sure that they were first invented in 1770s.
说实话，我不知道。但有一点可以确定，它们最早是在18世纪70年代发明的。
invent /?n?vent/ v. 发明，创造
◆ to tell the truth 说实话
用橡皮把错误擦掉
rub out mistakes with an eraser
A：If you draw or write in pencil you can always rub out mistakes with an eraser.
如果你用铅笔画画或写字，你就可以随时用橡皮把错的地方擦掉。
B：I know, but I have no pencil.
我知道，可是我没有铅笔。
◆ rub out（擦掉，擦去）为英式英语的说法，也可以直接用erase 来表示。
借某人的橡皮 borrow someone's eraser