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In the current world game market, many countries have established their own complete and sound game rating systems, such as the ESRB system in the United States, the PEGI system in Europe.
The full name of ESRB is Entertainment Software Rating Board, it was found by the Entertainment Software Association in 1994 in America. The committee is a non-profit industry organization. Its responsibility is to assess the content of electronic games and provide consumers (especially parents) with age-appropriate guidance on the content of computer games or online videos. ESRB's game ratings system have two kinds of manifestations, one is the rating identification, they are named like EC (early Childhood), E (everyone, content for everyone over 10 years old), T (Teen, content for players over 13 years old) ), M (mature, suitable for players aged 17 and above), AO (Adults Only, only for players above 18 years old). The other is the explanation of the content of games, which informs consumers the content that may appear in the game. (Liu, p.81)