最さい高こう水すい準じゅん

noun, noun which may take the genitive case particle 'no'

highest level; high-water mark

Used for the peak standard, quality, or record level in a field. Often appears in formal or business contexts.

• この製せい品ひんは業ぎょう界かいの最さい高こう水すい準じゅんを達