专业四级是针对英语专业同学的重要考试，其真题的参考价值无可比拟，希望同学们能够吃透真题，通过专四。

Hints:
Yale
Chubb
Good afternoon, everybody. Thank you very much for inviting me here to talk about safety in dormitory and personal security. First, a few points to bear in mind. You' ll notice the doors of your dorm have two types of locks, a Yale lock and a Chubb lock. Make sure you double lock your door, not just one lock, both of them, however long you are going out for. Make sure when you go out, all the windows are closed. Those of you in the ground and first-floor rooms will notice that you are locking windows, make sure you use them. Lock them every time you go out; lock them at night. If you have got expensive equipments in your room, first of all, insure it. So many people lose things and haven' t got insurance. Make sure you insure it. This brings me onto personal security. Wherever possible, avoid working alone late at night, especially girl students. Avoid dark streets, and try to stick to the well-lit streets whenever possible. Also if you know you are going to be up late, make sure you' ve got enough money for a taxi to get home again, or arrange to stay with friends for the night. It may sound absurd, but don' t forget the university actually offers free self-defense classes. I hope it something you' d never have to use, but, um, it certainly was going along to a few self-defense sessions.