The series is selected from the RELC series of teacher learning portfolios published by SEAMEO Regional Center of Singapore.With high practicability and operability, the series covers the hot topics of theoretical research on linguistics and teaching skill development; and the introduction and the Chinese notes of each volume are composed by well-known scholars of famous universities in China, which are suitable for readers of different levels.The series can be used for teachers education and training, and also good reading books of self-learning for English teachers in primary and secondary schools.