With aging, the detectable rate of gingival bleeding and calculus was increasing, the prevalence of JP was also increasing. 随著年龄的增长,牙龈出血及牙石的检出率逐渐上升,牙周炎的患病率也逐渐增高。
The methods of increasing leaching speed and factors of affecting bioleaching rate are disscused. 从几方面探讨了提高细菌浸出率的方法。