11. greenhouse gas emission n 二氧化碳排放

　　12. accelerate the pace of global warming v 加速全球变暖步伐

　　13. underline the ozone layer v 破坏臭氧层

　　14. lead to greenhouse effect v 导致温室效应气体

　　15. …… is a kind of industry that could create a number of job opportunities and promote the prosperity of relevant industries …… 是一种产业，可以创造许多就业机会以及促进相关产业的繁荣。

　　16. Only by traveling by air can travelers enjoy the high speed, superior comfort and first-rate service 只有做飞机旅行，我们才能享受到速度，舒适，一流的服务.。

　　17. International trade and tourism n 国际贸易和国际旅游业。

　　18. New types of fuel will definitely be explored and then, substitute some highly polluted fuels. 探究新型的燃料，代替高度污染的燃料。

　　19. Air travel will pose less threat to the environment 空中旅行对于环境造成较少的威胁

　　20. New type of fuel, which has the trait of low-consumption and eco-friendliness. 具有低消耗和环保特征的新型燃料。