Two toddlers are playing in a water fountain.
There are childern playing
Children imply persons of a young age. Toddler is another name for a young person. That there are two toddlers means the plural of child, children, is used.
exists e1 x1 x2 x3.(in(e1,x2) & n_fountain(x2) & of(x2,x3) & n_water(x3) & Actor(e1,x1) & v_play(e1) & n_toddler(x1) & card_eq_2(x1))
exists p1 x1 s1 x2.((x1 = x2) & n_playing(x2) & a_childern(s1) & Theme(s1,x2))