0.be aware of your mistake all the time！1.R发音技巧：嘴巴和嘴唇努力前伸。2.W发音技巧：嘴巴也要前伸，做ooo发音装，之后发出w的音。3.注意W和V的发音区别。v是上牙咬住下嘴唇释放发音。4.发音paragraph：Ray was bron in Russia.He dreamed of bbuilding the perfect roller coaster at the grand canyon in arizona.He had a friend named Fred who lived in Norway. Fred's profession was designing railroad tracks, and his career involved traveling all around the world.Ray thought it would be perfect if Fred designed his roller coaster ride. Fred was creative, brilliant, and worked well with railroad tracks.He would be the pperfect engineer for the project.the ride took two years to construct and was painted Red and White.Everyone really wanted to ride the brand new roller coaster.