本集核心英语单词及例句：

1.idiom (n.)成语，习语
An idiom is a group of words that form a collective meaning that is different than the meanings of the individual words that create the expression.
成语是由表达总体意思的一组单词组成又不同于每个单词所表达的意思。

2.group (n.)组；团体
Most North American teenagers will do anything to become members of their school's so-called "cool group".
大多数北美青少年要做什么才能成为他们学校的"酷一族"的成员。

3.meaning (n.)意义；含义
He spoke so quickly that I had a difficult time catching the meaning of what he was trying to say.
他讲得太快，我很难理解他想说什么。

4.pupil (n.)学生；未成年人
She had been a model pupil as a girl; however, the older she got, the worse a student she became.
她是一个模范学生；然而，她年纪越大，变得越糟。

5.outdo (v.)胜过
Sometimes, small firms can outdo big businesses when it comes to the qulaity of customer care they offer their clients.
在顾客服务方面，有时小企业可能优于大企业。

6.outperform (v.)胜过
Many Greenhill students learn so quickly that they soon outperform their colleagues who study at rival schools.
许多Greenhill学生学习如此之快以至于他们很快超越了他们竞争对手的学校。

7.keyword (n.)关键字;关键词
When you're studying a language，the keyword is patience.
学习一门语言，最重要的是有耐心。