x1 is a/the bone/ivory [body-part], performing function x2 in body of x3; [metaphor: calcium] /:/ [x2 is likely an abstract: may be structure/support for some body part, but others as well such as the eardrum bones; the former can be expressed as (tu'a le )]
le bongu (x1) - bone
le se bongu (x2) - function of bone
le te bongu (x3) - body with bone
