brain drain
human capital flight
/suto3/google.iconbrain drain
/suto3/Google画像検索.iconbrain drain
/suto3/Google定義検索.icon brain drain
/suto3/wikipedia.iconbrain drain
/suto3/weblio.icon brain drain
/suto3/kotobank.icon brain drain
/suto3/jisho.icon brain drain