Scroll Ball 滚动球 ; 骨碌球
A scroll ball makes it easy to get between letters for editing.
轨迹球使得人们更为容易的在字母间进行编辑。
Shaking the phone or touch screen will pop a Crystal Ball. The Crystal Balls can scroll, move or bounce on the screen of the mobile phone.
晃动手机或者触摸屏幕就会有一个水晶球弹出来。水晶球可以在手机的屏幕上滚动，移动和弹跳。
I wouldn't call it a scroll but more like a ball.
我不会把它叫做涡旋，但更象一个球。
应用推荐