A black and white motorcycle is being ridden around a racetrack.
There is a motorcycle at the racetrack.
A motorcycle that is being ridden around the racetrack implies it is at the racetrack.
exists e1 s1 s2 x1 x2.(around(e1,x2) & n_racetrack(x2) & Theme(e1,x1) & v_ride(e1) & n_motorcycle(x1) & a_white(s2) & Theme(s2,x1) & a_black(s1) & Theme(s1,x1))
exists p1 x1 x3.(n_racetrack(x3) & exists x2.((x1 = x2) & at(x2,x3) & n_motorcycle(x2)))