The fruits should be treated with lemon juice when sliced to prevent oxidation.
The fruits will oxidize if not covered in lemon juice.
Lemon juice are used in fruits which will oxidize if not covered in the juice.
exists e1 p1 x1.(n_fruit(x1) & exists e2 e3 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 x1.(n_fruit(x1) & all s1.((Theme(s1,x1) & a_not(s1)) -> exists e2 e1 x2 x3.(for(e1,e2) & in(e2,x2) & n_juice(x2) & of(x2,x3) & n_lemon(x3) & Theme(e2,x1) & v_cover(e2) & Actor(e1,x1) & v_oxidize(e1))))