| 摘要 |
PROBLEM TO BE SOLVED: To prevent a decline of learning efficiency when a language learner studies using a new document which is too difficult for the learner or is out of the field in which the learner is interested. SOLUTION: The learner registers already known words and a field in which the learner is interested, and a retrieval server, based on the registration, finds and provides a document in the field the learner is interested in including a few unknown words. A website on the Internet is one of the retrieved parties.
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