Presentation documents have been increasingly used not only as supplementary presentation materials but also as contents for investigative learning. In learning a presentation document, learners generally need to select a number of slides from the document, which describe what they want to learn or should learn. However, it is not so easy to find…

'We have the right to talk and think in our own language.' This self-evident slogan is ever challenged in the digital age of the 21st century. 'Talking and thinking' is most effectively trained and achieved by formal education carried out in one's own language. However, multilingual children growing up in multilingual societies would have to…