重点讲解:
1. a variety of 各式各样;多种多样;
People change their mind for a variety of reasons.
人们会由于种种原因改变主意 。
2. be exposed to 使接触;
It is a closed society in the sense that they've not been exposed to many things.
他们接触的事不多,从这一方面来说这是个封闭的社团 。
3. pick up the slack 接手他人不再做的工作;补位提供;
As major airlines give up less-traveled routes, smaller planes are picking up the slack.
由于大型航空公司放弃了乘客较少的路线,一些较小的飞机正在加紧补位 。
4. break down (使)(物质)分解;
Sugar and starch are broken down in the stomach.
糖和淀粉在胃里被分解 。
n. (动植物的)产地,栖息地