As the cursor traverses the screen, carrying with it an outline of the source object, it passes over one drop candidate after another. These drop candidates must visually indicate that they are aware of being considered as potential drop targets.

• 当光标带着源对象的轮廓在屏幕上移动时，经过一个又一个拖放候选对象，这些拖放候选对象必须在视觉上显示它们已经意识到自己正被当做可能的拖放目标。