世界大戦: World War

to study / to learn

important, significant

importance, consequence, significance

history / the study of history

制定: enactment, establishment, institution / 裁定: ruling, award, arbitration / 井底: well bottom / 蜻蜓: large dragonfly, specifically hawker (dragonfly of the family Aeshnidae)

制定: enact, establish / 裁定: (law) rule, award

成員, 正員: regular member / 成因: origin / 精飲: semen ingestion as a sexual act

清淡: clean and light, pure and clear

成端: termination (as at the end of a cable or wire) / 正旦: New Years day; (more specifically) New Years morning / 生誕: birth, nativity; the first appearance of something / 西端: the western edge of something