Note that you invalidate the display list in either case because you want Flex to render (or remove) the focus rectangle around the box.

注意，两种情况都会导致显示列表无效，因为您需要 Flex 呈现（或删除）方框周围的焦点矩形。

youdao

The style doesn't really matter — you can use an old PC case with a rear pull-off shell, an Apple G3 case, or even a Sun Microsystems server box.

风格其实并不重要-你可以使用普通电脑机箱或是苹果G3，甚至是Sun微系统服务器框旧电脑。

youdao

Otherwise, the exception is caught by the class library (or worse, the host), and the user will be presented with a dialog box in the best case and a missing control in the worst case.

否则，异常将会被类库接收（或者更糟，被宿主机），最好的情况下用户仅看到一个对话框，最糟糕的情况下则显示缺失控件。

youdao