annulus conjecture円環予想[基礎]annulus: {名} : 環、環帯{かんたい}、環形{かんけい}、輪、金環{きんかん}--------------------------------------------------------------------------------【発音】ae'njэlэs、【分節】an?nu?lus(a) conjecture: (a) conjecture思議しぎa conjecture: a conjecture推知すいち