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William：
I believe it is the only solution to this problem.
我相信它是解决这个问题的唯一对策。
Laura：
That's debatable, I think. I can come up with five other solutions as good as that.
我想这种说法大有问题。我可以想出其它五种同样好的对策。
William：
Do you really think so? If you take everything into consideration, you will see that mine is the only choice.
你真的以为如此吗？如果你通盘考虑，就知道我的对策是唯一的选择。
Laura：
Then, why don't you explain it in detail?
那么，你何不详细说明一下？