_~_時間にわたって痛みを軽減する provide pain relief for __ to __ hours / provide __ to __ hours of pain relief
例文
Kaishaku (to assist someone in committing hara-kiri by beheading him ) refers to cutting off the head of a person committing seppuku (japanese ritual suicide by disembowelment ) with a katana (sword ) for the purpose of relieving the person ' s agony of disemboweling . 介錯(かいしゃく)は切腹に際して、腹を切る時の痛みを軽減するために対象者の首を刀で刎ねること。