The...the second I.

第二个"它"
"Is this the best possible form of the argument?"

"它是否能最好地表述论点"
Not the most colorful version,

而不是最华丽的版本
not the most outrageous version,

也不是最惊人的版本
but the best possible version.

而是最佳的版本
- How do you define "Best"? - I define it by the source.

-怎么定义"最佳" -根据消息源
I define it by the number of relevant facts it contains,

根据它包含相关事实的数目
and I define it by an X factor that I trust Will and myself to determine,

根据我和威尔加起来五十年经验
using our combined five decades in the field.

总结出来的经验公式
What's the best possible version of the Birther argument?

"出生地怀疑论"的最佳版本是什么
There isn't one. And that's the fourth--

不存在这就引出了第四点
Ah! This one's an A.

啊这次是个"报"