一系列控制杆连着一枚指针，在刻度盘上显示出压力数。
A series of levers joined to a pointer shows pressure on a dial.
还添加了一组新注释工具，其中包括高亮显示器、指针工具、更好的颜色控制和可编辑文本。
A new set of annotation tools has also been added, including a highlighter, pointer tools, better color controls, and editable text.
不过，我们需要给它一些“活力”，我们要给它添加一个指针来显示基于一些事件的当前状态。
However, we need to add "life" to it, by adding a needle which shows the current state of some process based on some event.
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