The fruits should be treated with lemon juice when sliced to prevent oxidation.
treating fruits with lemon juice does not prevent oxidation
Treating fruits with lemon juice either does or does not prevent oxidization, it can't do both.
exists e1 p1 x1.(n_fruit(x1) & exists e3 e2 p2 x2 x3.(when(e2,e3) & Recipient(e3,p2) & Topic(e3,x1) & v_slice(e3) & exists e4 x4.(Theme(e4,x4) & Actor(e4,x1) & v_prevent(e4) & n_oxidation(x4)) & with(e2,x2) & n_juice(x2) & of(x2,x3) & n_lemon(x3) & Theme(e2,x1) & v_treat(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_should(e1))
exists e1 x1 x2 x3 x4.(-exists e2 x5.(Theme(e2,x5) & Actor(e2,e1) & v_prevent(e2) & n_oxidation(x5)) & with(e1,x3) & n_juice(x3) & of(x3,x4) & n_lemon(x4) & Theme(e1,x2) & Actor(e1,x1) & v_treat(e1) & n_fruit(x2) & n_thing(x1))