مشکل آموزش دوگانه است: اول، مشکل طراحی؛ دوم، مشکل علاقه مند نگه داشتن افراد به اندازه ای که در مدرسه بمانند.
Our editorial team hasn't reviewed this quote yet, so neither its source nor its attribution has been confirmed. Treat it as unverified for now.