New York：The Big Apple

New York got the nickname because it is a city full of chances. It is said New York's musicians began to use it in the 1920s. There is an old saying in show business，"There are many apples on the tree，but only one big apple. When you chose New York，you picked the big one. ”

Paris：The City of Light

Paris has the name because there are so many lights in streets at night. However, there was a time when Paris had almost no lights. In 1828，Pairs began to build a network of street lights. It was the first city in Europe to do so，and it has the nickname "The City of Light".

London: The Big Smoke

London got its nickname because of the serious air problem during the late 19th century. But now, smoke in London is not that common. In 1956, the government made laws to clear the fog（雾）in the city. Now，it's easy for people to enjoy a sunny sky beside the beautiful Thames River.