If you park your car in the wrong place,a traffic policeman will soon find it ,You will be very lucky if he lets you go without a ticket.However,this does not always happen.Traffic police are sometimes very polite.During a holiday in Sweden,I found this note on my car:"Sir,we welcome you to our city.This is a "No Parking"area.You will enjoy your stay here if you pay attention to our street signs.This note is only a reminder."If you receive a request like this,you can not fail to obey it.请帮我把这篇短文翻译一下