確認 の訳語→ affirmation ascertainment establish identification question validation verification
請け合う の訳語→ assure confirm guarantee promise say vouch
説明 の訳語→ account clarification commentary describe description discussion elucidation enlighten explain explainer explanation rationality reason remarks rundown story summation tell
約束 の訳語→ agree agreement appointment arrange arrangement bargain commitment deal pledged request word