赤穂義士: loyal retainers of Akō Domain, famously known as the forty-seven rōnin

貞信公: posthumous name of Fujiwara no Tadahira, Heian-period politician

予備校: prep school, cram school; privately-run schools marketed to students taking examinations for college admissions

恒春: Hengchun, Taiwan / 広春, 香舜, 光春, 光俊, 功俊, 宏春, 恒春, 晃舜: a male given name / 江春, 耕俊, 耕春, 高春: a male given name / 香春: a female given name

好物: one's favorite food / 鉱物: minerals / 公物: public property

後背位: doggy style

難航: have a hard flight, have a rough passage; run into difficulties, have a rough time

高額: large amount of money / 工学: engineering / 光学: optics / 後学: future reference / 好学: love of learning

構成中: (software) being in the process of configuring, currently configuring

項目: item, point / 綱目: main point and details