曾经无数次被央视一则广告感动:一个背书包的女孩骑着自行车回家。十五六岁的她,一路唱着歌为在黑夜中独行的自己壮胆。在胡同的拐角,一位卖小吃的老人正慢悠悠地收摊儿。“大爷。”女孩经过老人时,熟悉地叫了一声。老人用手将摊儿上的灯 Once countless times by CCTV an ad moved: a backpack girl riding a bike home. Fifteen and sixteen years old, she sang songs all the way for the courage to walk alone in the dark. At the corner of the alley, an old man who sells snacks is taking a leisurely break. “Grandpa. ” Girl passed the old man, familiar cry. The old man will be tapping the lights on the child