练习材料：Lesson 4 An exciting trip
I have just received a letter from my brother, Tim. He is in Australia. He has been there for six months. Tim is an engineer. He is working for a big firm and he has already visited a great number of different places in Australia. He has just bought an Australian car and has gone to Alice Springs, a small town in the centre of Australia. He will soon
visit Darwin. From there, he will fly to Perth. My brother has never been abroad before, so he is finding this trip very exciting.
任务配置：L0+L4
知识笔记：单个词汇的音标没有练透，导致后面一直结巴出错
练习感悟：手机自带的字典不太习惯，只能换回到欧路词典手动输入查询了。
