近期的PTE考试，Retell lecture频繁出新题，
小柠檬收集了近期最高频的Retell lecture，
让同学们复习机经时有更多优秀的学术资料，
能在考场上更有底气地回答出retell lecture的答案。
往期链接：
Taxonomy
主要内容介绍：
这段录音是一段关于taxonomy的课程录音，
无难词，非常好听懂，偏口语化。
老师用美国邮政寄信的方式来
和taxonomy生物分类学做了一个类比。
笔果还原听力原文：
Welcome to today’s lesson, we are continuing with our study of taxonomy. Taxonomy is how scientists classify organisms into different groups based on the characteristics that they share. So for instance, a good way of thinking about taxonomy is the U.S. postal service. If we want to send a letter to someone, we first start off by addressing it to the nation they are in, by default, we usually assume that’s America, but it doesn’t have to be, it could be England, or Costa Rico or Spain, you put their nation or their kingdom. Then within that Kingdom, you address it to a slightly more specific level, umm, their state, so for instance, South Carolina, would be the same as the … (gibberish…), within that state, you would address it to their city. And then to their street number, the street they live on, and then you would address it to say, their apartment complex, within that complex, you’d address it by their last name to their family. And finally the first name, to the specific person you want to get it to. And in that way, we are able to weed out all the 400 million people we don’t want to send our letter to, in America, and pinpoint the exact person we want the letter to reach. And (in) the same way, scientists use taxonomy, trying to pinpoint a living creature and organism and how it relates to everything else in the world.
听力词汇/词组：
Taxonomy 分类学，分类法
Classify 分类
Organisms 生物体
Base on … 根据……的基础
Characteristic 特点
U.S. postal service = USPS 美国邮政
Start off by 一开始做……，从……开始
Addressing 定地址
By default 默认设置
Slightly 稍微
Apartment complex 小区
Weed out 除掉,清除
Pinpoint 精确地找到，准确描述
Retell lecture要点：
1. 描述这段录音的主要内容：
关于分类学和利用美国邮政寄信的类比。
The speaker mainly talked about the analogy of Taxonomy and U.S. postal office.
2. 描述taxonomy的定义：
Taxonomy is how scientists classify organism/creatures into different groups based on the same characteristics.
3. 描述postal service 和 taxonomy 的相似之处：
There are many similarities between sending a letter and taxonomy, the speaker mentioned that when we want to send a letter, we address it to the nation, the state, and then more specific level, the city, street, street number, the person’s family name and eventually to the very specific person.
4. 描述taxonomy和sending out letter的用法：
We are able to weed out all 400 million people we don’t want the letter to reach, scientists use taxonomy to pinpoint living creatures and organism in the same way.
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