A massive oak claims its ground for 200 years or more, outcompeting all other would-be canopy trees by casting a dense shade and drawing up any freewater in the soil.
Free to adjust water height and Angle, when clean rough ground, to ensure the cleaning effect.
自由调节水刮高度和角度，在清洁高低不平的地面时，确保清洁效果一致。
3
The results further our understanding of soil-water interaction under shaking, and provide the data for validating the analytical methods of the seismic response of freeground.