A flight attendant is demonstrating safety devices.
A flight attendant is using a seat belt
We have no idea if the flight attendant is using a seat belt or one of the other many safety devices.
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_demonstrate(e1) & n_device(x3) & of(x3,x4) & n_safety(x4) & n_attendant(x1) & of(x1,x2) & n_flight(x2))
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_use(e1) & n_belt(x3) & of(x3,x4) & n_seat(x4) & n_attendant(x1) & of(x1,x2) & n_flight(x2))