From a property of the triangle a vector expression is deduced with two practical corollaries . here two proofs are presented 摘要从三角形的一个性质中得出三质点质心满足的一个向量表达式，并得到两个有实用价值的推论，同时对上一性质给出两个简洁的证明。
The center of mass is important to consider because two animals with similar weights may move in different ways depending on how their mass is distributed 质心是重要的考虑因素，因为相似体重的两只动物可能根据质量如何分部不同，而采取不同的行动方式。
Also , this method used the way of superviseing to get centroid , which making radial basis function neural network has better capability of classified 此聚类方法采取有监督的学习方式，将训练样本的形心作为隐节点的质心，训练样本的分类数作为隐节点的个数。
Based on the method , a tracking window method is adopted to track the target , and locate the position of target centroid by adjusting the window self - adaption 本算法采用动态窗口法,利用目标颜色的概率分布特征,锁定目标的颜色分布区域的质心,达到快速准确的跟踪效果。
For side or front thrusters , use 2 to 4 thrusters per side ( not set in stone ) , remember to place them more or less symmetrically compared to the center of mass of the ship 对于侧推进器或前推进器，每边使用2 - 4个推进器（可以改变） ，记住：放置位置尽量与飞船质心相对称。
Thirdly , visual c + + is adopted in programing application interface . the interface is simple and visual , the operations of data acquisition and finding the centroid is easy 采用visualc + +编写应用程序界面,界面简单、直观、易于操作,使用者可以轻松的完成采集图像及计算质心等操作。
