重点讲解：
1. free time
自由时间；非工作时间，空闲时间； 闲暇；
eg. Please come round again when you have free time.
以后有工夫再来吧！
eg. Reading occupies most of my free time.
阅读占去了我大部分的闲暇时间。
eg. People who use their free time well are usually healthy and happy.
善于利用空闲时间的人通常健康又快乐。
2. save sb. sth.
动词接双宾语；表示省去某人做某事的麻烦；
eg. I'll try to save him the expense of a flight from Perth.
我会设法替他省下要从珀斯飞来的机票费用。
eg. They have save me a lot of trouble.
他们使我省了许多麻烦。
