重点讲解：
1. play a role in 作用；地位；角色；
例句：Internet plays a very important role in modern life.
互联网在现代生活中发挥非常重要的作用。
2. according to 据…所说；按…所载；
例句：You've been in prison six times according to our records.
根据我们的记录，你曾入狱六次。
3. due to 由于；因为；
例句：All planes are grounded due to the bad weather.
由于天气恶劣，所有飞机都停在了机场上。
4. be expected to do sth. 预期；预料；
例句：Cold temperatures are expected to stay awhile.
寒冷的天气估计还要持续一段时间。
