迟到的原因The Reason of Being Late

Teacher: Johnny, why are you late for school every morning?
Johnny: Every time I come to the corner, a guidepost says, 'School -- Go Slow'.
老　师：约翰尼，为什么你每天早晨都迟到?
约翰尼：每当我经过学校附近的拐角处，就见路牌上写着‘学校-缓行’。