牙周炎是一类以牙槽骨吸收为主要特征的感染性疾病，但其病因理论中的许多具体机制尚未明了。
Periodontitis is an infectious diseases and the key feature is bone resorption, but the exact mechanism of etiology is unclear.
研究了西北太平洋夏季风特征及其季风槽结构对台风生成的影响。
The influence of Northwest Pacific summer monsoon(NWPSM) characteristics and the structure of monsoon trough on typhoon genesis is studied.
长期以来，选矿厂主要依靠工人观察浮选槽表面泡沫的物理特征，来完成浮选过程的控制。
Since a long time, in order to implement the process control of flotation, almost all the factories depend on human observation to obtain physical characteristics of bubble surface.
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