Construction site surrounded by chain link fence.
The dangerous site is protected by a chain link fence.
A construction site may be surrounded by a chain link fence to keep people out for any reason and not necessarily because the site is dangerous.
exists e1 x1 x2 x3 x4 x5.(Actor(e1,x3) & Time(x3,x5) & n_fence(x5) & n_link(x3) & of(x3,x4) & n_chain(x4) & Theme(e1,x1) & v_surround(e1) & n_site(x1) & of(x1,x2) & n_construction(x2))
exists e1 s1 x1 x2 x3 x4.(n_site(x1) & a_dangerous(s1) & Theme(s1,x1) & Actor(e1,x2) & Time(x2,x4) & n_fence(x4) & n_link(x2) & of(x2,x3) & n_chain(x3) & Theme(e1,x1) & v_protect(e1))