A tree surgeon hard at work in a basket that is sometimes called a cherry picker.
a surgeon at work
A tree surgeon is a type of surgeon, and both sentences state that there is a surgeon at work.
exists e2 e1 s1 s2 x1 x2 x3 x4 x5 x6 x7 x8 x9.(at(e1,x5) & in(x5,x6) & a_sometimes(s2) & Manner(e2,s2) & Recipient(e2,x8) & Theme(e2,x7) & v_call(e2) & n_picker(x8) & of(x8,x9) & n_cherry(x9) & (x6 = x7) & n_basket(x6) & n_work(x5) & Theme(e1,x2) & Actor(e1,x1) & v_event(e1) & Theme(s1,x4) & a_hard(s1) & (x2 = x4) & n_surgeon(x2) & of(x2,x3) & n_tree(x3) & n_thing(x1))
exists x1 x2.(a_topic(x1) & at(x1,x2) & n_work(x2) & n_surgeon(x1))