It is developed based on the flow pattern of fluid in a trough depending on the type of impeller, the type of accessories and their related position in space, and on the tornado formation mechanism.
The trough type Devonian was intimately associated with the platform-type Devonian in time and space but they show appreciable difference in mineralization.
海槽型泥盆系与台地型泥盆系在时空上均紧密衔接，但成矿作用有明显差别。
3
The library became the major pass trough route of the school, an open space that one has to cross in order to enter the classrooms or go to the administration.