Zhang smiles and says that later, the method's effectiveness and its vigorous promotion by school principals and department heads prompted these reluctant teachers to ask him for demonstrations. In this way, Zhang's method slowly spread throughout China.
他笑說，後來因為上層領導重視、大力提倡，很多英語老師也看到成果良好，都自動上門要求他們去介紹，才慢慢走遍全國。