Even parents who strive to teach their children manners are appalled at how easily those lessons can be undone by what takes place beyond their homes.

也有一些父母尽心尽力教导自己的孩子要有礼貌，但他们却吃惊地发现，家庭外所发生的事情轻而易举地就把他们的所有努力化为泡影了。