Hello again, I have just realised that there are 2 expression for mouse button: 1鼠标键 2鼠标按钮 It looks like option 1 is much more common. Do you use 1, and if so, why? The funny thing is that 按钮, button, originates from software, the interface, an area you can click, whereas 键 stems from hardware, a key you press with your finger, like Alt/Esc key. I do not know why English literally messed it up. Could it be that option 2 reflects a growing influence from English, whereas option 1 is strictly speaking correct? 谢谢!