风和日丽的下午,克里斯蒂和孩子们开车去拜访好友凯西。托德和马吉一到凯西家就跑到后院玩去了。克里斯蒂提醒他们要远离房子后面的铁道。为了保险起见,她仔细地用脚画了一条想象的界限。“不要越过这条线,”她警告说。 On a sunny afternoon, Christie and the children drove to visit her friend Casey. Todd and Magee went to Kathy’s house and ran to the backyard to play. Christie reminded them to stay away from the railway behind the house. To be on the safe side, she carefully painted a boundary of imagination with her feet. “Don’t cross this line,” she warned.