I talked about doubleness last time.

我上次说过双重写照。

And that's another kind of doubleness in Frost.

这也是弗罗斯特的另一种双重写照。

I only know myself as a human entity: the scene, so to speak, of thoughts and affections; and am sensible of a certain doubleness by which I can stand as remote from myself as from another.

可以说我是反映我思想感情的一个舞台面，我都着双重人格，因此我能够远远的看自己就如别人一样。