基础目标：
Vocabulary(词汇): army, Canada, Canadian, medical, treat, treatment, Dr(=doctor), war, invent, tool, operate, operation
Useful phrase(有用的短语):give one’s life to 献身于,save one’s life 救某人的生命,in spite of 尽管……,in the end 最后,take care of 照顾,stop to do sth 停下来去做某事,stop doing sth.继续做某事,both…and………和……都
