Parents don't know how heavy the pressure is __their children

Parents don't know how heavy the pressure is __their children
Parents don't know how heavy the pressure is __their children

Parents don't know how heavy the pressure is __their children
on
Parents don't know how heavy the pressure is on their children
压力在孩子们上,用on

父母亲不知道他们子女的压力有多重

父母不知道子女的压力有多大 ()到装)