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1·This star is a red giant with a visual magnitude of 17.

这颗恒星是一颗红巨人与一个视觉幅度17。

2·With the creation of distribution function of dynamic visual magnitude threshold (VMT), the static VMT in traditional visual magnitude filtering method is replaced by dynamic VMT.

引入了动态星等阈值分布函数，将传统星等阈值过滤算法中的静态阈值用动态星等阈值代替，建立了一种新的动态星等阈值过滤选择模式。

3·Atmospheric conditions and the visual acuity of the observer will often reduce limiting magnitude.

大气状况和观察者的视觉灵敏度也会降低边缘亮度。

4·We can find the underlying regularity from magnitude data so as to provide effective and visual data for industrial measure and decision of control.

从海量数据中，找到其中隐藏的规律，为工业测量和控制决策提供有效、直观的数据。