176647 けいこう傾向をはっけん発見するため、１９５０ねん年から１９７０ねん年までのＸＹＺねんかん年鑑をしら調べた。 The XYZ Almanacs from 1950 to 1970 were studied to discover the trend. — Tatoeba Discussions Log in to talk about this sentence.