John is an expert at driving a car. 约翰是开车高手。
She is an expert in flowers. 她是花卉方面的专家。 Sam is an expert on that problem. 萨姆是研究那个问题的权威。
2. develop [di'veləp] v. 养成 develop the file/film冲洗胶卷 develБайду номын сангаасp：发展 developing skills：发展技巧 developing country发展中国家
2. This time he was barking so that
someone would let him out!
this time 这次 so that 以便，便于，表示目的
in order to/that 为了
so as to/so that 也可表目的
Lesson 59
In or out?
First listen, and then
answer the questions:
1.What bad habit has Rex developed? 2. Why did Rex run away?
Words and expressions:
1.expert 表示“做/干……的专家/高手”时后面通常用 at doing sth.; 表示在某一领域是“专家”、“权威”时可用介词in或on:
as 表示原因，complain of 抱怨某事 spend weeks 花了几个星期 spend 时间/金钱 (on/in) doing sth. 花费时间/金钱做某 事
train sb. to do sth. 训练某人做某事 let sb in让某人进来 let sb out让某人出去 let sb down让某人失望
developed country发达国家
with the development of the economy 随着经济的发展
课文讲解
1. As the neighbours complained of the noise, my husband spent weeks training him to press his paw on the latch to let himself in.