这些网站采用书面指导（教学时间）的形式和友好建议的口吻。

These sites take the style of a written tutorial (teaching period) and a tone of friendly advice.

youdao

这些网站采用书面指导（教学时间）的形式和友好建议的口吻。

These sites take the style of a written tutorial (teaching period) and a tone of friendly advice.

youdao