I'm a firm believer in the benefits of exercise.
我对运动的好处坚信不疑.
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.
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.
Well, I have no doubt about it.
唉, 对此我坚信不疑.
He firmly believes this and is certain that in spite of all the trials and tribulations through which he must pass he will finally attain that goal.
他对此坚信不疑,并且确信:尽管他必须经过三灾八难,他最最终将达到目的。
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