As an expert in British parliamentary procedures, I can explain the tradition of the Black Rod knocking on the door. The Black Rod, also known as the Gentleman Usher of the Black Rod, is an officer of the House of Lords in the Parliament of the United Kingdom. The act of the Black Rod knocking on the door is a ceremonial event that takes place during the State Opening of Parliament.

The tradition dates back to the 16th century and is said to symbolize the independence of the House of Commons from the House of Lords. The Black Rod knocks on the door of the House of Commons to summon the MPs to the House of Lords to hear the Queen's Speech, which outlines the government's agenda for the coming parliamentary session.

Here is the explanation in English, followed by the translation in Chinese:

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Traditionally the door of the Commons is slammed in Black Rod's face to symbolise the Commons independence. He or she then bangs three times on the door with the rod. The door to the Commons Chamber is then opened and all MPs �C talking loudly �C follow Black Rod back to the Lords to hear the Queen's Speech.read more >>