重点讲解：
1. break down 捣毁；拆除；
例句：Firemen were called after his father failed to break the door down.
他的父亲没能把门砸开，后来就把消防员叫来了。
2. so as to do sth. 为的是； 以便；
例句：Please check the list carefully so as to avoid mistakes.
请仔细核对单子以避免发生错误。
3. on the spot 在现场；
例句：Mr Connolly is their 'man on the spot' and the person you can call if you have a complaint.
康诺利先生是他们的“现场代表”，要投诉可以和他联系。
4. mean to do sth. 有意；故意；
例句：Sorry, I didn't mean to frighten you.
对不起，我不是故意吓唬你的。
5. crack down on 严厉打击；镇压；
例句：We should ruthlessly crack down on piracy.
我们必须严厉打击盗版。
