What I call the first generation tools capture raw mouse movements or keystrokes and take snapshots of the pixels on the screen. 我称为第一代的工具只是捕获原始的鼠标移动或击键操作，并记下屏幕上象素的瞬象。
A third new application was to protect a downhole screen across a water-injection zone from being damaged by debris during a workover. 第三个新的申请，以保护井下屏幕跨越注水区被损坏的碎片在修井。
