A bike mechanic explains the physics of a bike to a registered nurse.
The mechanic is explaining something.
The mechanic is explaining something refers to the physics of a bike to a registered nurse.
exists e1 s1 x1 x2 x3 x4 x5.(n_physics(x3) & Theme(e1,x3) & Actor(e1,x1) & v_explain(e1) & of(x3,x4) & to(x4,x5) & n_nurse(x5) & a_registered(s1) & Theme(s1,x5) & n_bike(x4) & n_mechanic(x1) & of(x1,x2) & n_bike(x2))
exists e1 x1 x2.(n_mechanic(x1) & Theme(e1,x2) & Actor(e1,x1) & v_explain(e1) & n_thing(x2))