But a long life is not unalloyed good news .

但是寿命长并不一定是纯粹的好消息。

Yet in the canadian province of quebec , news of abundant gas in the shale beneath the st lawrence river basin has not been met with unalloyed joy .

然而，在加拿大魁北克省，圣罗伦斯河流域页岩中蕴藏丰富天然气的消息并未给人带来真正的欢乐。

It seemed like unalloyed good news .

这好象是纯粹的好消息。

Bond traders regard central bank bond purchases as an unalloyed positive .

债券交易人将央行购买债券之举视为纯粹的利好因素。

But whether that is an unalloyed blessing , they say , is considerably less clear .

不过他们认为，这种做法是不是一种纯粹的福祉，现在尚不十分清楚。