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。
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。
The artificial improvement of drainage could soon lead to a marked loss in nutrients.
采用人工排水措施可以迅速导致养分含量显著降低。
The artificial improvement of drainage could soon lead to a marked loss in nutrients.
采用人工排水措施可以迅速导致养分含量显著降低。
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