The former is more precise than the latter which serves only an approximate method.
振型迭加法是比较准确的计算方法，而拟静力法是近似的计算方法。
Sliding window is an approximate method which is concerned about the recent data in the data stream.
滑动窗口是数据流中一种关注近期数据的近似方法。
In this paper, an approximate method of using three tangent arcs to substitute the involute gear profile curve is put forward.
提出用圆弧来代替渐开线齿形的近似方法，实现了渐开线齿轮三维实体造型的直接编程生成技术。
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