empirical
empirical evidence
https://source.unsplash.com/featured/?empirical#.png
/suto3/google.iconempirical
/suto3/Google画像検索.iconempirical
/suto3/Google定義検索.icon empirical
/suto3/wikipedia.iconempirical
/suto3/weblio.icon empirical
/suto3/kotobank.icon empirical
/suto3/jisho.icon empirical