重點講解：
1. allow sb. to do sth.
允許；容許；準許；
eg. That will allow the machine to pick up the movements of a player.
它能夠讓機器記錄玩家的動作。
eg. Don't allow a minor irritation in the workplace to mar your ambitions.
不要讓工作中的一點煩心事打擊了你的雄心抱負。
2. be proud of
驕傲的；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，你應(yīng)當為之自豪。
eg. His father was quite naturally very proud of him.
他父親自然為他感到無比驕傲。
3. a tract of/tracts of
（土地等的）大片；
eg. A vast tract of land is ready for development.
一大片廣闊的土地可待開發(fā)。
eg. They cleared large tracts of forest for farming, logging and ranching.
他們清除了大片的森林以經(jīng)營農(nóng)耕、采伐與畜牧。