Santa traditionally navigates the frosty night skies on December 24th without using a compass or a chart to plot his course.
圣诞老人通常在12月24日寒冷的夜空中航行,而不用罗盘或地图来规划路线。
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If you plot this information on a daily chart (like figure 6), you can see if over time the size and number of messages being delivered locally to this DPAR are changing.