例 The wpvalve ensures a smooth, laminarairflowoverits surface allowing more airinto the engine Surface ships operate at the interface between two media of differing density water air) and are therefore subject to the interaction between them-determination of the most suitable shape is therefore a complexmatterforwhich there is no comprehensive theo r Muchofthe pollution caused by cars happens when they change speea Aplug-and-play version ofthe valve, in whichelectricaland pneumatic connections are achieved by simply sliding the valve into position and locking it, willbe seen next ye ear Then comes the analysis ( or computation intemalforces例： The WP valve ensures a smooth, laminar airflow over its surface, allowing more air into the engine. Surface ships operate at the interface between two media of differing density (water and air), and are therefore subject to the interaction between them-determination of the most suitable shape is therefore a complex matter for which there is no comprehensive theory. Much of the pollution caused by cars happens when they change speed. A plug-and-play version of the valve, in which electrical and pneumatic connections are achieved by simply sliding the valve into position and locking it, will be seen next year. Then comes the analysis (or computation) of internal forces