重点讲解：
1. aim to do sth. 致力于；旨在；以…为目标；
They are aiming to reduce unemployment by 50%.
他们正力求使失业人数下降50%,|c&ZoIyWA!C|VUY[v。
2. be due to 由于；因为；
I was relieved to find out that my problems were due to a genuine disorder.
得知我的问题确实是由于病症引起的，我松了口气GMV,7j+c-^6tM。
3. in contrast 相比之下；与…相反；
In contrast, the lives of girls in well-to-do families were often very sheltered.
相反，生活在富裕家庭的女孩子通常都备受呵护c^3XtRy74DwV-u。
4. be involved in 卷入的；参与的；与…有密切关联的；
They have been involved in a campaign of deceit.
他们参与了一系列的欺骗活动hJs=pag5Z-33-。