重点讲解：
1. allow sb. to do sth.
允许；容许；准许；
eg. That will allow the machine to pick up the movements of a player.
它能够让机器记录玩家的动作。
eg. Don't allow a minor irritation in the workplace to mar your ambitions.
不要让工作中的一点烦心事打击了你的雄心抱负。
2. be proud of
骄傲的；自豪的；得意的；
eg. That's a beautiful piece of work. You should be proud of it.
那件作品非常漂亮，你应当为之自豪。
eg. His father was quite naturally very proud of him.
他父亲自然为他感到无比骄傲。
3. a tract of/tracts of
（土地等的）大片；
eg. A vast tract of land is ready for development.
一大片广阔的土地可待开发。
eg. They cleared large tracts of forest for farming, logging and ranching.
他们清除了大片的森林以经营农耕、采伐与畜牧。