field survey
実地調査
field research
https://source.unsplash.com/featured/?field-survey#.png
/suto3/google.iconfield survey
/suto3/Google画像検索.iconfield survey
/suto3/Google定義検索.icon field survey
/suto3/wikipedia.iconfield survey
/suto3/weblio.icon field survey
/suto3/kotobank.icon field survey
/suto3/jisho.icon field survey