重点讲解：
1. encourage sb. to do sth.
鼓励；劝说某人做某事；
eg. The idea is to encourage people to get to know their neighbours.
其目的是促使人们结识邻居。
eg. Her success encouraged me to try the same thing.
她的成功鼓励我尝试做同样的事。
2. by accident
意外；偶然；
eg. This doesn't happen by accident; it happens by design.
但它不是偶然发生的，是精心设计才得以完成的。
eg. She knocked the vase off by accident.
她不小心把花瓶打掉了。
3. choose to do sth.
甘愿；决定做某事；
eg. The place we choose to live affects every aspect of our being.
我们所选的居住地影响了我们生存的方方面面。
eg. Many students choose to continue their study because of the tightmarket.
因为工作难找，许多学生选择继续学习。