But they actually exist, and quite validly at other levels.

但它们确实存在，并且在其他层面上非常有效。

We may say: 'Derivative knowledge is what is validly deduced from premisses known intuitively'.

我们可以说：“派生知识是从直觉已知的前提中有效地推导出来的知识” 。

Thus we shall have to amend our definition by saying that knowledge is what is validly deduced from known premisses.

因此，我们将不得不修改我们的定义， 说知识是从已知前提有效地推导出来的东西。

But are we to say that nothing is knowledge except what is validly deduced from true premisses? Obviously we cannot say this. Such a definition is at once too wide and too narrow.

但是我们是否可以说，除了从真实前提有效地推导出来的东西之外，没有什么是知识？显然我们不能这样说。这样的定义既太宽又太窄。