Triple junction is the intersection point among three plate boundaries. The boundary could be tensional, compressional or shear fault.
三条板块边界常相交于一点，这一个交点就叫做板块三联接合点（简称三联点，或称三节点）。
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The three dimension flow field in the triple-screw extruder with triangle configuration is the research objects, including velocity field, pressure field and shear rate field etc.