have infinite faith in ...;profound faith in ...;not have the slightest doubt ;
I'm a firm believer in the benefits of exercise.
我对运动的好处坚信不疑.
Physicists believe in the validity of conservation laws.
物理学家们对于各种守恒定律的有效性一直是坚信不疑的.
He was a great believer in the corrosion-resistant qualities of cast iron.
他对铸铁的耐腐蚀性坚信不疑.
Well, I have no doubt about it.
唉, 对此我坚信不疑.
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