Many of my friends are using word processors but I still swear by my old typewriter.
我有许多朋友都使用文字处理机,可我还是爱用我的老式打字机。
I swear by Almighty God that I will tell the truth.
我对万能的上帝发誓我要说真话。
I swore her to secrecy about what I had told her.
我要她起誓对我告诉她的事保守秘密。