在求轨迹中要抓准动利用静

摘要

Use static elements or relative static elements in the changing graph to get the main moving point and its relations with other known conditions to correctly calculate the orbit equation.%利用变动图形吕的静止或相对静止因素，抓住主要动点及其与已知条件的联系，正确求出轨迹方程．