Definition: a serious promise or decision Level: C2
他发誓定期给朋友写信。
He made a ___vow to write to his friend regularly.
仪式上，这对夫妇交换了誓言。
During the ceremony, the couple exchanged their ___vows.
违背誓言会破坏关系中的信任。
Breaking a ___vow can damage trust in a relationship.
