The addresses, encapsulated as source and destination in the IP datagrams header, are used to transmit the datagram to their destination, called routing. Basically, this creates two scenarios
地址（在 IP 数据报头中封装为源和目的地地址）用来将数据报传输到其目的地，这个过程称为 路由。
2
Characteristics of the non-relational data source are encapsulated within the wrapper.
非关系数据源的特征都封装在包装器中。
3
The remote query encapsulated by the leftmost SHIP operator is sent to the remote data source at which the US.Sales table resides.