translation.en: As you can see in blue, huge areas of our world are barely seen, less than once a year, and even the areas that are seen most frequently, those in red, are seen at best once a quarter.
translation.zh: 你可以看到蓝色的区域 全球有大面积的地方 几乎看不到 图像少于一年一次 即使是那些最经常看到的区域 红色的区域 也只是最多每个季度看到一次