What is so special about December 4th in history?

  On December 4, 2013, China's abacus application was successful.

  On December 4, 1952, the world's worst "smog" event occurred in London: a continuous thick fog lasted for nearly a week, and the entire city was covered by thick fog and plunged into darkness.

During this period, more than 4,700 people died of respiratory diseases.

  December 4 is there every year. Which year of today has a special meaning to you?

What unforgettable thing happened?

Do you have any friends who celebrate their birthday today?

Raise your hand in the message area,

I wish you a happy birthday, happiness and health every day!

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