280,587KM-240KM=280,347KM
https://tw.news.yahoo.com/%E5%B9%95%E5%BE%8C-%E4%B8%AD%E5%85%B1%E6%89%AF%E5%88%A4-%E5%8F%B0%E7%8D%A8-%E6%AD%BB%E5%88%91-%E5%
https://tw.news.yahoo.com/%E9%A6%96%E5%AF%8C%E7%9A%84%E6%B5%AA%E6%BC%AB2-%E9%BB%83%E4%BB%81%E5%8B%B3%E9%A6%AC%E6%96%AF%E5%85
https://tw.yahoo.com/home/%E5%8D%B0%E5%B0%BC%E5%B3%87%E9%87%8C%E5%B3%B6-%E9%80%AE%E6%8D%95103%E5%90%8D%E5%A4%96%E5%9C%8B%E4%
លុបបំបាត់កន្លែងដើមនៃក្រុមក្លែងបន្លំ លុបចោលការចុះបញ្ជ