他没有解释他为什么兴建两条，但我怀疑它涉及到了胜利的经验。
He didn't explain why he was building two, however, I suspect it relates to his Triumph experience.
我原则上是同意它的，但我怀疑在实践中它是否会发生。
I agree with it in principle but I doubt if it will happen in practice.
虽然积极的信念不能保证成功，但我怀疑没有它你会成功。
Although positive belief doesn't guarantee success, I doubt that success is possible without it.
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