本集核心英语单词及例句：

1.sign (n.)标志
Greenhill's teaching methods are a signs of the times.
格林希尔的教学方法是一个时代的标志。

2.percent (n.)百分比，百分数
One percent of the Chinese market is 13 million people.
中国市场的百分之一就有1300万人。

3.basically (adv.)主耍地;从根本上说;基本
This is basically what's happened over at yahoo.
基本上雅虎就是在这么干。

4.colleague (n.)同事；同僚；同行
It's one thing to compliment a colleague's scarf.
赞美同事戴的围巾是一回事。

5.downtown (n.)市中心
This is a plaza located just north of wall street in downtown manhattan.
该广场坐落在曼哈顿市中心华尔街以北的地方。

6.tip (n.)小窍门；小费;末梢;提示
If you tip badly, people think less of you
如果你掏的小费少，人们就会看轻你。