vow

n.誓约

v.发誓

All the men took a vow of loyalty to their leader. 所有士兵都发誓效忠他们的指挥官。

Once he took the vow his loyalty never wavered. 他一旦宣了誓，他就一直忠贞不渝。

Catholic priests take a vow of celibacy. 天主教神父发誓不结婚。

I vowed never to reveal the secret. 我发誓决不泄漏这一秘密。

I vow to give my time and strength to this case. 我发誓将我的时间和精力致力于这一事业。