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 .
