Lesson 35: Future transportationNew wordscertainlyadv. 当然presentationn. 介绍;表达invention n. 发明present v. 展现roundadj. 圆的wing n.翅膀dangerous adj.危险的factoryn. 工厂North America北美洲humorous adj. 幽默的as long as只要wingn. 翅膀On hund