1 a small, often round, piece of plastic, wood or metal that you use for fastening your clothes 钮扣；扣子: One of the buttons on my jacket has come off. 我的夹克掉了一粒扣子。This blouse is too tight -- I can't fasten the buttons. 这件女衬衣太窄，我扣不上。

2 a small part of a machine, etc that you press in order to operate sth 按钮；旋钮；键: Press the button to ring the bell. 按下这个按钮铃就会响了。To dial the same number again, push the ‘redial’ button. 重拨同一个号码，按“重拨”键。Which button turns the volume down? 哪个旋钮用来把音量关小？To print a file, simply click on the ‘print’ button. 若要打印文件，你只要用鼠标点击一下“打印”键。Double click the left mouse button. 将鼠标上左边的键点击两次。 ☞pictures at handle and telephone 见 handle 及 telephone 插图