I have no doubt that the sky is blue, but I doubt your love.

还不曾怀疑天的蓝，我却怀疑你的爱。

youdao

It's rare that the sky is blue and clear in Beijing. You should take advantage and go for a walk in park.

北京的天气很少这么干净这么蓝，你最好利用这个机会去公园走一走。

youdao

It's rare that the sky is blue and clear in Beijing. You should take advantage and go for a walk in the park.

蓝色干净的天空在北京挺少见的。你应该趁机去公园走走。

youdao

Maybe it could refer to either the poet or the sun throughout the entire line, if you think of the mantle blue as being the actual sky that the sun is able to twitch over his shoulder.

或者两者皆可,从整句的行文看来，如果你们把蓝色的丝巾看作是真实的天空的话,那么太阳的确是能够在他的肩上轻轻颤动。

耶鲁公开课 - 弥尔顿课程节选

But, and here is the limit to such blue-sky optimism, this does not mean that it will be: solvable problems are not always solved.

ECONOMIST: A Survey of the 20th Century