technical progress
technological change
/suto3/google.icontechnical progress
/suto3/Google画像検索.icontechnical progress
/suto3/Google定義検索.icon technical progress
/suto3/wikipedia.icontechnical progress
/suto3/weblio.icon technical progress
/suto3/kotobank.icon technical progress
/suto3/jisho.icon technical progress