苦痛を

pain

→ 苦痛
phrase Rare #36,838
pain 苦痛 means “pain” or “suffering,” and を marks it as the object of a verb, such as “relieve pain” or “cause pain.”
JA: 薬で苦痛を和らげました。
EN: I relieved the pain with medicine.

その薬は彼の苦痛を和らげた

The medicine relieved his pain.