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The Japanese word

救援

is pronounced
kyuuen | きゅうえん
means
rescue, reinforcement
Examples:
彼らは直ちに我々の救援にやってきた。
karera wa tadachini wareware no kyūen ni yatteki ta.
They came presently to our rescue.
救援隊は子供をしらみつぶしに捜した。
kyūen tai wa kodomo o shirami tsubushi ni sagashi ta.
The rescue worker searched the area, looking for the child.
救援隊が到着したとき彼はまだ生きていた。
kyūen tai ga tōchaku shi ta toki kare wa mada iki te i ta.
He was still alive when the rescue party arrived.
救援作戦はトモダチサクセンと名付けられた。
kyūen sakusen wa tomodachisakusen to nazuke rare ta.
The rescue operation was called "Operation Tomodachi".
救援機は強風と酷寒に対処しなければならなかった。
kyūen ki wa kyōfū to kokkan ni taisho shi nakere ba nara nakatta.
The rescue flight had to reckon with strong winds and freezing temperatures.
救援作戦はオペレーション・トモダチと名付けられた。
kyūen sakusen wa operēshon.tomodachi to nazuke rare ta.
The rescue operation was called "Operation Tomodachi".
Examples sourced from tatoeba.org