1) He swore mightily.
他发下重誓。
2) He took an oath to give up smoking.
他发誓戒烟。
4) he vowed under his breath.
他低声地发誓说。
5) He vowed he would never fling in the towel
他发誓决不认输。
6) He swore that he could tell the truth.
他发誓要说真话。
参考词条