观察点设置问题是地形可视性分析中的一类重要问题，在空间信息辅助决策、电信、野生动物保护等领域有着广泛的应用。
The observer sitting problem is important in terrain visibility analysis and is widely used in spatial information aid decision, telecom, and animal protection and so on.
观察点设置问题是地形可视性分析中的一类重要问题，在空间信息辅助决策、电信、野生动物保护等领域有着广泛的应用。
The observer sitting problem is important in terrain visibility analysis and it is widely used in military, telecom, animal protection and so on.
最简单的是purify_watch (addr)，它在特定地址的四个字节上设置了一个读取-写入观察点。
The simplest is purify_watch (addr), which sets a read-write watch point on four bytes starting at the given address.
事实上，您可以为purify在purify_stop_here设置一个观察点(正如先前所阐述的那样，在“使用带有调试器的purify”部分)，在每次运到错误的时候停止(或者消息)。
In fact, you can set a breakpoint at purify_stop_here (as explained earlier in the "Using purify with the debugger" section) for purify to stop at every error (or message).
设置观察点的API将返回一个整数型值，即刚刚设置的观察点数字。
The APIs that set watch points return an integer value, which is the watch point number that was just set.
当从两个观测点观察时，这些塔可以测量每年的太阳高度变化，并以近乎完美的精度为太阳设置了弧形的缺口。
When viewed from two observation points, the towers measure the annual rising and setting arcs of the sun with near-perfect accuracy.
当从两个观测点观察时，这些塔可以测量每年的太阳高度变化，并以近乎完美的精度为太阳设置了弧形的缺口。
When viewed from two observation points, the towers measure the annual rising and setting arcs of the sun with near-perfect accuracy.
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