重点讲解：
1. in effect
其实；实际上；
eg. That deal would create, in effect, the world's biggest airline.
事实上，这一协议将促成世界最大航空公司的成立。
eg. The two methods were in effect identical.
那两个办法实际上是一样的。
2. now and then
时而；有时；
eg. He takes my sister out to the theatre now and then.
他时常带我妹妹去剧院。
eg. Everyone needs a pat on the back now and then.
每个人都需要不时地得到鼓励。
3. best of all
最好的是；
eg. It was comfortable and cheap: best of all, most of the rent was being paid by two American friends.
房子既舒适又便宜：最妙的是，大部分租金是由两位美国朋友支付的。
eg. Best of all, over time the benefits endure and continue to improve.
最棒的是，这些益处会随着时间持续存在，而且会逐步增加。