1. a whitish rubber derived from the coagulated milky latex of the gutta-percha tree. 
   一种发白的橡胶，来自古塔树的凝乳胶。
2. channel point, meridional point 
   经穴
3. PPP(Point to Point Protocol) 
   点对点通讯协议
4. Point of penetration; breakthrough point 
   切入点
5. nodal point voltage method 
   节点电压法

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