重点讲解：
1. due to 由于；因为；
The train had stopped due to a mechanical problem.
火车因为机械故障停了下来。
2. in order to 为了；以便；目的在于；
We stood up in order to get a better view.
我们站起身来以便看得更清楚。
3. step down 辞职；下台；让位；
He stepped down last month because of illness.
他上月因病辞去了职务。
4. scale back 缩小；缩减；减弱；
Several car factories have been forced to close or scale back activity.
数家汽车厂已被迫停产或减产。