求翻译：行当的划分由来已久，大约在七八百年以前，元人杂剧时代，就划分出来很多行当。 京剧行当又称角色，主要可分为生、旦、净、丑，共四大行当。是什么意思？

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Boca Chica has been for a long time and broken down in about 7800, before the times $zaju, who carved out on many stepparents. Peking opera, also known as Boca Chica, roles can be mainly divided into dependent, once a total, net, the ugly, 4 large stepparents.

The trade division is long-standing, approximately before 7800 years, the Yuan person zaju time, divides very many trades. The Peking opera trade calls the role, mainly may divide into lives, the day, only, the clown, altogether four big trades.

Division of business for a long time, about seven hundred or eight hundred years ago, zaju of the Yuan dynasty era, divide out a lot of business. Opera business also known as roles, can be divided into health, denier, net, and the ugly, the four racket.

Division of business for a long time, about seven hundred or eight hundred years ago, zaju of the Yuan dynasty era, divide out a lot of business. Opera business also known as roles, can be divided into health, denier, net, and the ugly, the four racket.