"I'll write," I promise solemnly.
我庄严地发誓会给他们写信。
We solemnly promise: your trust, we will return to the meticulous service!
我们郑重承诺：对您的信任，我们将回报以无微不至的服务！
He vowed quite solemnly that he would carry out his promise.
他非常庄严地发誓要实现他的诺言。
He vowed quite solemnly that he would carry out his promise.
他非常庄严地发誓要实现他的诺言。
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