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[DeepL Translation - needs review] The fourth edition focuses on how English, the world's lingua franca, can be used more easily and and flexibility, and how it can be used appropriately in each field. and flexibility in their respective fields. To this end, many new materials have been collected and selected for practical use, and the existing material has been reviewed with a fresh perspective and refined and supplemented. The following points were emphasized in the revision process. The s...