![Workers replace glass panes on the clock face of Queen Elizabeth tower, commonly known as Big Ben on the Houses of Parliament, in central London, Britain July 11, 2018. (Photo/Agencies)](http://www.ecns.cn/hd/2018/07/12/60fb4ca397264665a8084e744967add3.jpg)
Workers replace glass panes on the clock face of Queen Elizabeth tower, commonly known as Big Ben on the Houses of Parliament, in central London, Britain July 11, 2018. (Photo/Agencies)
![Workers replace glass panes on the clock face of Queen Elizabeth tower, commonly known as Big Ben on the Houses of Parliament, in central London, Britain July 11, 2018. (Photo/Agencies)](http://www.ecns.cn/hd/2018/07/12/4f5378e39694444881e62610db62980f.jpg)
Workers replace glass panes on the clock face of Queen Elizabeth tower, commonly known as Big Ben on the Houses of Parliament, in central London, Britain July 11, 2018. (Photo/Agencies)