重点讲解：
1. die from 死于；
例句：The soldier died from an infections would.
这个士兵死于伤口感染。
2. be able to do sth. 可以…的，能够…的；
例句：Companies must be able to compete in the market-place.
公司一定要在商品交易中有竞争力。
3. due to 由于；因为；
例句：He was really out of shape due to long inactivity.
因为他长久的不活动，所以他身体的状况不好。
4. in order to 为了；以便；目的在于；
例句：In order to complete the project speedily, they didn't rest on Sundays.
为了迅速完成这项工程，他们连星期天都没休息。
