英语语法分析

It is not an unmixed blessing.

这说不上是纯粹的幸福。

But, for all that, their poverty is a great and almost unmixed evil to them.

不过，话虽如此，他们的贫困对他们总是一种巨大的而且差不多是纯粹的祸患。

It is one of the great troubles of life that we cannot have any unmixed emotions.

人生一大烦恼，在于无法拥有纯粹的情感。