所有的粒子都有一个由被优化的函数决定的适应值(fitness value)，每个粒子还有一个速度决定他们飞翔的方向和距离。然后粒子们就追随当前的最优粒子在解空间中搜索。-All of the particles have a fitness value is determined by the function to be optimized (fitness value) of each particle, there is a speed determine the direction an