[实用参考]Typhoo台风英语讲解.ppt

Group 6 Typhoon 1.?Definitions of typhoon. 2. Causes?of typhoon. 3. The disadvantages of typhoon. 4. The advantages of typhoon. 5. Methods of prevention?of typhoon. Five parts 1.Typhoon is a name used in east Asia for a Hurricane. 2.Typhoon is a type of cyclone occurring in the western regions of the Pacific Ocean. 3.A typhoon is similar to a hurricane in levels of destructiveness. 4.The word typhoon comes from the Chinese term tai-fung meaning great wind. Part one : definitions of typhoon 5.The typhoon center is called the eye of typhoon .The diameter range from 10km to 70km,45km on average. The wind speed and air pressure in the eye of typhoon both are the lowest,and the weather appear to be windless,partly cloudy,warm and dry. 6.The level of typhoon TY：The average wind speed in the center of bottom ranges from 32.7m/s to 41.4m/s，the level 12-13. STY(severe typhoon)：The average wind speed in the center of bottom ranges from 41.5m/s to 50.9m/s，the level 14-15. Super TY：The average wind speed in the center of bottom is higher than 51.0m/s, the level 16 or higher.(Rammasun 17) Now I will tell you how typhoon come into being. Mostly in summer and autumn there exists typhoon. In broad sea surface ,when temperature rises above 26 degrees , the vapor would go up cause the air near sea surface is lighter than the air above .when the air goes up it will be turned into liquid for the higher, the colder , releasing more heat ,which helps the lower air goes up .And it continues and cycles. And the liquid is heavier than air, so the air dropped down and there is a rainfall . Because of the coriolis force it becomes rolling around and around .Then typhoon is there.When typhoon arrives at lands ,trees and buildings will cut down its force ,making lessdamage and loss . Part two: Causes ?of Typhoon Part three : disadvantages of typhoon 1. Typhoon may?destroy?the crops. 2. Typhoon is one of the weather systems?that brings heavy rain. in the typhoon?ar