indispensability, being essential

to sum this up in one word

湯桶読み: A reading pattern for certain kanji compound words, using the native Japanese kun'yomi for the first kanji, and the Chinese-derived on'yomi for the second kanji.

(linguistics) a reading pattern for a kanji-compound word, using the native Japanese kun'yomi for the first portion, and the Chinese-derived on'yomi for the second portion

(honorific) (used to express gratitude for someone's words) something said by someone

each word and each phrase; word-for-word

Synonym of 黄昏 (tasogare, “dusk; twilight”) / Synonym of 黄昏時 (tasogaredoki, “dusk; twilight”)

皮膚科学: dermatology

abyss / edge / deep pool

鱶鰭スープ: shark fin soup (Chinese soup made from shark fins)