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This paper describes and evaluates the Computer Assisted Language Learning (CALL) Tool, which supports contextual language acquisitions. The CALL Tool searches for and retrieves parallel texts, while aligning unedited Japanese-English parallel texts from the World Wide Web [Pershin, Akahori, 2001]. We compared the proposed tool with an existing system by conducting an experiment that showed our system's effectiveness in phrase acquisition, discourse-structure acquisition and text comprehension. However, this experiment also exposed the drawbacks of the proposed system, such as a poor interface design. We concluded that the proposed system could be used together with existing systems to increase the number of learning strategies available for language learners.