Using drainage ability strong permeability foam concrete can be as light, the gravel based on in or artificial turf, as a playground use.
使用排水能力强的可渗性泡沫混凝土作为轻质基础，上面覆以砾石或人造草皮，作为运动场用。
2
Methods According to different clinical manifestation and compression degree. We could use artificial air bleeder, blocking drainage and adhesion to test the effect.
方法根据不同临床表现及气胸压缩程度采取人工抽气、闭式引流术、胸膜粘连术等检测效果。
3
The artificial improvement of drainage could soon lead to a marked loss in nutrients.