Photo taken on Nov. 19, 2014 shows the Harrods in Knightsbridge, London. London, located in southeastern England, is the capital of the United Kingdom. Standing on the River Thames, the city plays a key role in the world's financial, commercial, industrial and cultural fields. (Xinhua/Han Yan)

Photo taken on Nov. 19, 2014 shows the Christmas decorations on the Bond Street in London. London, located in southeastern England, is the capital of the United Kingdom. Standing on the River Thames, the city plays a key role in the world's financial, commercial, industrial and cultural fields. (Xinhua/Han Yan)

Photo taken on Oct. 22, 2014 shows the Tower Bridge of London. London, located in southeastern England, is the capital of the United Kingdom. Standing on the River Thames, the city plays a key role in the world's financial, commercial, industrial and cultural fields. (Xinhua/Han Yan)

Photo taken on Sept. 27, 2015 shows the St. Paul's Cathedral in London. London, located in southeastern England, is the capital of the United Kingdom. Standing on the River Thames, the city plays a key role in the world's financial, commercial, industrial and cultural fields. (Xinhua/Han Yan)

Photo taken on Oct. 19, 2014 shows the Hyde Park of London. London, located in southeastern England, is the capital of the United Kingdom. Standing on the River Thames, the city plays a key role in the world's financial, commercial, industrial and cultural fields. (Xinhua/Han Yan)

Photo taken on Sept. 27, 2015 shows a view of London. London, located in southeastern England, is the capital of the United Kingdom. Standing on the River Thames, the city plays a key role in the world's financial, commercial, industrial and cultural fields. (Xinhua/Han Yan)

Photo taken on May 7, 2015 shows London Eye in London. London, located in southeastern England, is the capital of the United Kingdom. Standing on the River Thames, the city plays a key role in the world's financial, commercial, industrial and cultural fields. (Xinhua/Han Yan)

Photo taken on Oct. 14, 2015 shows the Buckingham Palace in London. London, located in southeastern England, is the capital of the United Kingdom. Standing on the River Thames, the city plays a key role in the world's financial, commercial, industrial and cultural fields. (Xinhua/Han Yan)

Photo taken on Oct. 14, 2015 shows the Horse Guards Parade in London. London, located in southeastern England, is the capital of the United Kingdom. Standing on the River Thames, the city plays a key role in the world's financial, commercial, industrial and cultural fields. (Xinhua/Han Yan)

Photo taken on Oct. 14, 2015 shows the Queen Victoria Monument in front of Buckingham Palace in London. London, located in southeastern England, is the capital of the United Kingdom. Standing on the River Thames, the city plays a key role in the world's financial, commercial, industrial and cultural fields. (Xinhua/Han Yan)

Photo taken on May 21, 2015 shows a view of London. London, located in southeastern England, is the capital of the United Kingdom. Standing on the River Thames, the city plays a key role in the world's financial, commercial, industrial and cultural fields. (Xinhua/Han Yan)

Photo taken on May 21, 2015 shows a view of London. London, located in southeastern England, is the capital of the United Kingdom. Standing on the River Thames, the city plays a key role in the world's financial, commercial, industrial and cultural fields. (Xinhua/Han Yan)

Photo taken on Oct. 22, 2014 shows the Tower of London. London, located in southeastern England, is the capital of the United Kingdom. Standing on the River Thames, the city plays a key role in the world's financial, commercial, industrial and cultural fields. (Xinhua/Han Yan)