回纹针既小又简单, 但是他们用起来很棒.Paper clips are small and simple, but they are very useful.回纹针发明于1900年.The paper clip was invented in 1900.请用回纹针把这些纸张别在一起.We are enclosing here an inquiry sheet....

“回纹针”的英语可以翻译为：a paper clip，a paper fastene...