The screen then detects the location of each virtualkey you touch, and the screen displays the corresponding letter in the URL field.
之后屏幕将监测您触摸的每一个虚拟键的位置，并且在地址栏显示相应的字母。
2
If there is no use of the virtualkey word, those sub instances of the derived class instance are basically perfectly normal instances of a base class.
如果没有使用的virtual关键字，这些子派生类实例的实例基本上是很正常的一个基类的实例。
3
Touch screens can display soft keyboards if they are large enough; each virtualkey should be large enough to make it difficult for the user to accidentally mistype.