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

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

成端: to terminate a cable or wire, to put a terminal on the end of a cable or wire / 生誕: to give birth to someone or something / 製炭: to make charcoal

清淡: clean and light, pure and clear

not necessary to; don't have to

Expresses gratitude or relief for something that happened in the past, a choice made, etc.

If only ~

It's good / okay to... / is fine