HINTS：

场景：At the Lost Property Office in London with a Very Conscientious Attendant 

initials!

two-way

HQ

Well, I was in a hurry and the bus was so crowded. Do you have my bag or not? I might have, sir. I'm not sure. Well, how many black suitcases are handed in every day? With my initials! Now please don't shout. I only want to establish the correct ownership, that's all. Could you give me a list of contents? Well, there are a lot of things in the case: a black uniform I use at work, a hat that I wear when I'm on duty, a pair of black leather shoes with laces, and a two-way radio that I use for talking to HQ. HQ? Yes, police headquarters. I'm a police officer.