题目

英语翻译
Some inventions are so useful,but seem so simple,that we wonder why no one thought of them long ago.Post-it Notes,the pieces of paper that you can fasten almost anywhere and then remove without leaving any sign that they were there,are an example of such an invention.
　　Post-it Notes were invented about twenty years ago by Art Fry,a scientist at 3M Corporation.The idea for the product came from a frustrating experience he often had while singing in his church choir.Fry used pieces of paper as bookmarks to mark the places in his book of songs,but these bookmarks were always falling out.He knew he needed a bookmark that would stay where he put it,but that he could remove without damaging the pages.
　　Around that time,Fry heard about a new adhesive (粘合剂) that a colleague(同事),Dr.Spence Silver,had created.This adhesive was special because it was sticky,but not too sticky.It was strong enough to hold papers together,but weak enough to not tear the paper when it was removed.F

提问时间：2020-08-12

答案

有些发明是非常有用的,但是看起来那么简单,那我们不知道为什么没有人想到他们很久了.便签纸,纸的碎片,你可以把几乎任何地方然后删除没有留下任何迹象表明他们在那里,有这样一个发明的一个例子.后注意到大约二十年前...