残存は英語で
survival

英語の定義

残存
1. n. survival, residue
残存の部隊は撤退した。 - The rest of the forces withdrew from the battle field.
2. v. remain

survival
1. 名詞. 生いき残のこること、生存。
His survival in the open ocean was a miracle; he had fully expected to die.
彼が外洋で生き残ったのは奇跡だ。彼自身、自分は間違いなく死ぬものと思っていた。
2. 名詞. 生存者。
3. 名詞. 存続。
4. 名詞. （形容詞的に）緊急救難のために使う。
a survival kit
緊急避難具
5. 名詞. （スポーツ）リーグ残留。

survival
1. n. The fact or act of surviving; continued existence or life.
His survival in the open ocean was a miracle; he had fully expected to die.
2. n. (as a modifier) Of, relating to or aiding survival.
His survival kit had all the things he needed in the wilderness.
3. n. (sports) The avoidance of relegation or demotion to a lower league or division.
4. n. A custom or belief that persists in folklore from earlier times, when the rationale behind it is forgotten.