What does this knobby thing do ?

这个按钮是干什么的?

I hate her knobby knees .

我恨她圆圆的膝盖。

For loosely packed terrain consider a knobby tire .

对於松散地形考虑诺比的轮胎。

The surface is now slightly knobby and feels a bit grainy .

现在表面略有诺比，感觉有点粒状。

When did you start coming to knobby joints like this ?

你什么时候开始来这种鬼地方？