"以雄榫连接" can be translated as "connected with a male tenon" or "joined by a male tenon".
In woodworking and carpentry terminology, a "tenon" is a projection on the end of a piece of wood designed to fit into a corresponding hole or "mortise" in another piece, creating a strong joint. When specifying the gender of the tenon, "male tenon" refers to the projecting part, while "female mortise" (though not directly asked here) would refer to the receiving hole. So, "以雄榫连接" directly translates to emphasizing the use of the male tenon part in the connection.