The fruits should be treated with lemon juice when sliced to prevent oxidation.
The fruits are fresh.
The fruits are fresh because they've been treated with lemon 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 s1 x1.(n_fruit(x1) & Theme(s1,x1) & a_fresh(s1))