flashcard
フラッシュカード、単語カード、単語帳
spaced repetition
Leitner system
/suto3/google.iconflashcard
image flashcard
define flashcard
wikipedia flashcard
weblio flashcard
kotobank flashcard
jisho flashcard
flashcard-icon
https://scrapbox.io/api/pages/suto3/flashcard-icon/icon#.svg