PDF flachcards, made in Japan, gives you a great way of learning, e.g. foreign languages, by reviewing PDF books or comics . Whenever you read a PDF file, you can make a flash card of a scene that you want to review through just two-touch operation. (Flash cards are parts of a whole that you want to review to aid memorization through repeated practices.) The flash cards, each card has books or comics' one scene, help you memorize scenes efficiently and effectively. 【recommended for those who