堤防: a levee, an embankment along a body of water, a dike

ピタゴラスの定理: the Pythagorean theorem

宮廷: imperial court / 休廷: court recess / 宮庭: the Palace

低木: shrub

公定: official rate, official price (Verb: ～する (rōmaji -suru)) / 公庭: imperial court / 公廷: ^([definition?]) / 公邸: official residence / 功程: ^([definition?]) / 孝悌: filial piety and fraternal duty

協定: to make an agreement

競艇: boat race / 協定: agreement / 教程: curriculum / 胸底: bottom of one's heart / 筐底, 篋底: bottom of a box

低落: fall, decline

低落: fall, decline

探偵: detective / 端艇, 短艇: boat, rowboat