Class-tested and coherent, this textbook teaches classical and web information retrieval, including web search and the related areas of text classification and text clustering from basic concepts. It gives an up-to-date treatment of all aspects of the design and implementation of systems for gathering, indexing, and searching documents; methods for evaluating systems; and an introduction to the use of machine learning methods on text collections. All the important ideas are explained using examples and figures, making it perfect for introductory courses in information retrieval for advanced undergraduates and graduate students in computer science. Based on feedback from extensive classroom experience, the book has been carefully structured in order to make teaching more natural and effective. Slides and additional exercises (with solutions for lecturers) are also available through the book's supporting website to help course instructors prepare their lectures.

Collocations are combinations of words which frequently appear together. Using them makes your English sound more natural.

Vocabulary in Use Pre-intermediate and Intermediate is a vocabulary book for intermediate learners of English, primarily designed as a self-study reference and practice book, but which can also be used for classroom work. In its style and format it is similar to its upper intermediate and advanced equivalent, English Vocabulary in Use. - 100 easy-to-use units: over 2,500 vocabulary items in a wide range of topic areas are presented, contextualise and explained and explained on left-hand pages with a variety of follow-up activities on right-hand pages. - Helps to build on and expand existing vocabulary. - Suggests tips and techniques for good learning habits. - Designed to be flexible: can be used both for self-study and in class. - Provides a comprehensive key with not only answers to the exercises but also more comments on how the language is used. - Includes a detailed index with phonetic transcriptions.

En este libro encontrarás todas las palabras que tienes que conocer para el examen de Cambridge nivel B1, también llamado PET o PET for school.Cada una de las 2846 palabras viene con su o sus traducciones en español así como un ejemplo sacado de los exámenes oficiales de Cambridge de los últimos años.Ideal para aprender el vocabulario del examen, perfecto para repasar y excelente para hacerte a las frases del examen, ya que con cada palabra nueva que aprendes, practicas con una frase extracta de un examen oficial de Cambridge.

Compact Preliminary for Schools is a focused, 50 - 60 hour course for Cambridge English: Preliminary for Schools, also known as Preliminary English Test (PET). The Student's Book features eight topic based units with focused exam preparation to maximise the performance of school-age learners. Units are divided in the order of the exam with pages on Reading, Writing, Listening and Speaking. A Grammar reference covers key areas in the syllabus and unit based wordlists include target vocabulary with definitions. The Student's Book also features a revision section and full practice test. The accompanying CD-ROM provides interactive grammar, vocabulary and exam skills tasks including listening. Course users also have exclusive access to a further practice test with audio via a URL in the Student's Book.