take an oath devoutly;pledge in all sincerity and seriousness;vow solemnly;give sb. one's firm and solemn promise ;

China, we unite together, singing all sincerity and seriousness, Austria amiable and lovely.
祖国, 我们团结无间, 同声歌唱,信誓旦旦, 奥地利可亲可爱.
来源:互联网摘选They had given an absolute assurance that it would be kept secret.
他们信誓旦旦地保证将对此绝对保密。
来源:《柯林斯高阶英汉双解学习词典》But I do know that several people swore they could taste the difference.
但的确有人信誓旦旦地表示他们能品出其中的区别.
来源:互联网摘选虽然你开始信誓旦旦温存倜傥,可后来变得忤戾乖张.
来源:网络文摘精选Meg was much flattered by Mr. Ned's assurances that he came especially to see her.
尼特先生信誓旦旦地告诉麦格,他是专门为她而来的. 麦格听了真是受宠若惊.
来源:词典精选例句In 1990, we were all earnestly assured that property values could only go up.
1990年时我们都得到信誓旦旦的保证说房地产只可能升值。
来源:《柯林斯高阶英汉双解学习词典》The recent protestations of Hurstwood had given her courage to say this.
赫斯渥最近的信誓旦旦使她有了勇气这么说.
来源:互联网摘选Parrot promised faithfully to deliver the message, and then flew away smiling to himself.
鹦鹉信誓旦旦, 接着就对他微笑着飞走了.
来源:互联网摘选There were novelists of the time, like Howells, who avowed that they were " realists ".
当时的小说家如 豪威尔斯 等人,都信誓旦旦地自称是现实派.
来源:词典精选例句And his stubbornness seems to have undone the peace talks, despite his protestations.
视乎是他的倔强破坏了和平谈判, 尽管他对和平的信誓旦旦.
来源:互联网摘选
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