an obscure style
わかりにくい文体
an observatory that affords a panoramic view of the city
市を一望できる展望台
an obsolete word
廃語，死語
an obstacle between a mother and her son
母親と息子を阻む障害
an obstacle to success
成功の妨げ
an obstinate headache
がんこな頭痛
an obstructed view seat
（野球場などで）視界がさえぎられて見にくい席
an obtuse angle
鈍角
an obvious [a definite] advantage
明確な利点
an obvious liar
見え見えのうそつき
