引用元: https://ryugaku-kuchikomi.com/blog/ebbinghaus-the-forgetting-curve/
" data-medium-file="https://i1.wp.com/yoshidajyuku.com/wp-content/uploads/2021/03/08578d4da1648f23df3ab1f8ae5299d0.jpg?fit=300%2C198&ssl=1" data-large-file="https://i1.wp.com/yoshidajyuku.com/wp-content/uploads/2021/03/08578d4da1648f23df3ab1f8ae5299d0.jpg?fit=640%2C423&ssl=1"/>引用元: https://ryugaku-kuchikomi.com/blog/ebbinghaus-the-forgetting-curve/