They promised to be faithful to their ideal for ever.

他们保证永远忠于自己的理想.

《简明英汉词典》

You have sworn to be faithful to me.

你已立誓对我忠实.

《现代英汉综合大词典》

I plight that I will always be faithful to my work.

我发誓我会一直忠诚于我的工作.

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He swore to be faithful to us.

他发誓效忠我们.

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Pray that we keep our faith and be faithful to to the end.

祷告我们可以持所信仰,忠心至死.

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Only the person who has faith in himself is able to be faithful to others.

只有对自己有信念的人才能对别人守信用.

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It is in the nature of a dog to be faithful to his master.

狗有忠于主人的本性.

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