For elementary and pre-intermediate learners of English [For elementary and pre-intermediate learners of English] Oxford essential dictionary：[For elementary and pre-intermediate learners of English] oxford elementary learner's dictionary of english Oxford elementary learner's dictionary of english Oxford elementary learner's dictionary of English elementary anecdotes in american english An elementary English readings for middle-school teachers of English 并列题名：Practice and progress for intermediate students of English A Grammar Practice Book for Elementary to Lower-intermediate Students of English