An analytic expression for the intensity of the central point in Fresnel's circular aperture diffraction was derived using the methods of vector map and integration respectively.
分别用矢量图解法和积分法导出了菲涅耳圆孔衍射中心场点的光强的解析表示，方便了此类问题的分析。
But, still I think it's a very interesting example of why you might want to use vector methods to analyze motions.
但我认为这还是一个很有意思的例子，解释为什么我们要掌握向量的方法去分析运动。
Detection of insecticide resistance should be an essential component of all national malaria control efforts to ensure that the most effective vector control methods are being used.
杀虫剂耐药性检测应是各国疟疾控制工作的一项重要内容，以确保使用最有效的病媒控制方法。
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