the special interests,

特定的利益
the fact that some might know more than others about law or about politics.

以及部分人对法律或政治更了解
So Kant says,

所以康德说
"A contract that generates principles of right is merely an idea of reason

产生公正标准的契约只是一个理性的概念
but it has undoubted practical reality

但它确实实际存在着
because it can oblige every legislator to frame his laws in such a way

因为它能束缚每个立法者
that they could have been produced by the united will of the whole nation."

都在整个国家意志的框架内制定法律
So Kant is a contractarian,

康德是个契约论者
but he doesn't trace the origin

但他并未从实际的社会契约中
or the rightness of law to any actual social contract.

去寻求法律的源头或其公正性
This contrives to an obvious question.

这就有个明显的问题了
What is the moral force of a hypothetical contract,

对于一个假定的其实并不存在的契约