As limited by reservoir and well network, development effect of low permeable Chaoyanggou oil field has gone worse with the prolonging of the developing time.
低渗透朝阳沟油田由于受储层、井网的限制，随着开发时间的延长，开发效果逐渐变差。
However, its applications in the field of high concentration wastewater and most industrial wastewater as well as in the cold climates were limited.
但是其本身的局限却限制了它在高浓度废水、某些工业废水处理等方面的应用，在寒冷地区的应用也受到限制。
These findings must be regarded with caution owing to the limited data available. There is an acute need for well-designed and executed randomised controlled trials in this field.
这样的发现必须注意到有限的资料可以被取得，在这个领域中，设计良善且是随机对照的试验有其迫切需求。
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