重点讲解：
1. finish off
结束；完成；<非正>杀死；毁掉；吃光（某物）
eg. He began to tidy up his desk and finish off the week's work.
他开始整理书桌，结束一周的工作。
eg. He has to finish off three players to get the prize.
他得拼掉三个选手后才能获奖。
2. blow up
引爆；（使）炸毁；（使）爆炸；
eg. He was jailed for 45 years for trying to blow up a plane.
他因为企图炸毁一架飞机而被判入狱 45年。
eg. Their boat blew up as they slept.
他们睡觉的时候船爆炸了。
3. put on weight
体重增加；
eg. I'm lucky really as I never put on weight.
我很幸运，因为我的体重从来没有增加过。
eg. You have put on weight.
你发福了。
