But perhaps more innovative was use of touch : no more trackballs or styluses .

不过，iPhone最创新的地方也许是对触控操作的运用：再也用不着轨迹球或触控笔了。

This is excellent for devices that don 't have hardware trackpads or trackballs .

这对于那些没有触摸板或者轨迹球等硬件的设备来说，简直棒级了。

The new mode is especially important to support users on new devices that use virtual buttons in the system bar , rather than dedicated hardware buttons or trackballs .

对使用这种系统栏上有虚拟按键（而不是专用硬件或轨迹球）的新设备的用户，这种模式显得尤为重要。