1.核心算子measure_pos—Extractstraightedgesperpendiculartoarectangleorannulararc.  提取垂直于矩形或环形圆弧的直边measure_pairs—Extractstraightedgepairsperpendiculartoarectangleorannulararc提取垂直于矩形或环形圆弧的直边对；将返回

全文共18000字，讲解了网络测量和计数中的多方面知识：网络测量的意义、网络测量的手段分类、网络测量在实现上的挑战、以及解决这些挑战所用到的技术和协同方案等等。参考书籍有：《NetworkAlgorithmics:AnInterdisciplinaryApproachtoDesigningFastNetworkedDevices(2ndE

Problem: Youwanttomeasurethelapsedtimeandmakesurethatitisaccurate.Solution: UsethemonotonicclockintheTimestructtofindthelapsedtime. TheTimestructcontainsthedatabutonlyundercertaincircumstances.IfyoucreateaTimes