September 10, 2023 is my country’s 39th Teachers’ Day and the first Teachers’ Day after the successful convening of the 20th National Congress of the Communist Party of China. Recently, the Ministry of Education issued a notice to make arrangements for the celebration of Teachers' Day in 2023.

August 1st Army Day (Army Day) is the anniversary of the founding of the Chinese People's Liberation Army. On July 11, 1933, the Provisional Central Government of the Chinese Soviet Republic, in accordance with the proposal of the Central Revolutionary Military Commission on June 30, decided that August 1 would be the anniversary of the founding of the Chinese Workers’ and Peasants’ Red Army [5]. On June 15, 1949, the Chinese People's Revolutionary Military Commission issued an order to use the word "August 1" as the main symbol of the flag and emblem of the Chinese People's Liberation Army. After the founding of the People's Republic of China, this anniversary was renamed the Army Day of the Chinese People's Liberation Army. [5] According to the "Law of the People's Republic of China on the Protection of Military Status and Rights and Interests", August 1st of each year is the Army Day of the Chinese People's Liberation Army. People's governments at all levels and military units should organize activities such as celebrations and commemorations on the Army Day.

The four-color printing mode is a color registration mode used in color printing. It uses the principle of color mixing of three primary colors of color materials, plus black ink, and a total of four colors are mixed and superimposed to form the so-called "full-color printing". The four standard colors are: C:Cyan = cyan, also known as 'sky blue' or 'blue'; M:Magenta = magenta, also known as 'magenta'; Y:Yellow = yellow; K:blacK= Black, although some literature explains that the K here should be Key Color (positioning and registration color), but it is actually confused with the concept of positioning and registration used in plate making. The abbreviation here uses the last letter K instead of the beginning B to avoid confusion with Blue. The CMYK mode is a subtractive color mode, and the corresponding RGB mode is an additive color mode