free class has encountered problems
免费课堂曾遇难题 Free class has encountered problems 热心家长帮他招生，老课本一度脱销 Enthusiastic parents help him recruit students,Old textbooks once sold out ..
基于1个网页-相关网页
free class has encountered problems
免费课遇到了问题
以上为机器翻译结果，长、整句建议使用 人工翻译 。