请翻译成英文,不要机器翻的.

The United States did not unified teaching, primary and secondary materials are generally prepared by specialized companies, the market will have a course all versions of the same materials for schools and teachers to choose from. This meant that teachers have won freedom for the child's features : what more responsive materials, but also more suitable for teachers play, it went choice. American teachers to decide the teaching materials and teaching methods, the curriculum is only one principle : the realities of life, so practical. Education is an entirely different manufacturing industries : manufacturing and the need to be standardized, only standardization can have big industry. Education? Education may just need a personality, because everyone is vastly different, vastly different in personality development potential is generating creative teaching.

就这样了

There are no unified teaching materials in the United States.

Usually the teaching materials