重点讲解：
1. in favor of 支持；赞成；
例句：I am in favor of the second viewpoint.
我赞成第二种观点。
2. set off 引爆（炸弹）；触发，拉响（警报等）；
例句：He likes to set off firecrackers during Diwali.
他喜欢在排灯节放鞭炮。
3. clean up 打扫；清扫；把…弄干净；
例句：Nina and Mary were in the kitchen, cleaning up after dinner.
吃过晚饭，尼娜和玛丽在厨房里收拾。
4. kill off 毁灭；破坏；扼杀；使停止；
例句：Frost can kill off a young plant.
严寒会摧毁幼苗。
5. be known for 以…闻名的；
例句：The oboist is well known for his improvisation.
这位双簧管吹奏者以即兴演奏而著名。
