The central Kunming Lake covering 2.2 square kilometers was entirely manmade and the excavated soil was used to build Longevity Hill.
昆明湖占地220公顷，多为人工湖，其挖掘出的土壤用于建造万寿山。
2
Manmade accelerated erosion is a key reason for soil nutrient loss after forestlands were disturbed by human being.
林地被人为开垦破坏后，加速侵蚀是导致坡面土壤养分流失的根本原因。
3
Many factors can cause lawn hollow and hole, such as soil terrene, construction technology or force majeure and man-made factors, in which soil terrene is the main and direct factor.