宣誓：庄严地表示承诺或保证，通常在法庭上或重要场合下进行。
... make an oath 立誓, 宣誓 swear an oath 立誓, 宣誓 swear and take an oath 发咒起誓 ...
宣誓
Barons had to swear an oath of allegiance to the king.
贵族须宣誓效忠国王。
Before giving evidence, a witness has to swear an oath.
作证之前，证人必须宣誓。
Don't I need to swear an oath?
我难道不需要发个誓什么的？
The cardinals swear an oath as they are casting their ballot -- further discouragement.
Presentation ceremonies are performed daily and recipients must swear an oath to the Queen and the Lord Mayor.
Each man in turn stepped up and placed his hands on the Gospel to swear an oath in Latin.