25,552KM-4KM=25,548KM
https://www.hk01.com/%E5%9C%8B%E9%9A%9B%E5%88%86%E6%9E%90/1076302/%E5%BE%9E%E5%8F%B0%E7%A9%8D%E9%9B%BB%E5%81%9C%E4%BE%9B7nm%