out of the blue片语

突然、意外地、毫无预警地

She called me out of the blue after ten years of silence.

沉寂十年之后，她突然打电话给我。

突如其来的、意外的

An out-of-the-blue job offer changed all of her plans.

一份突如其来的工作邀约打乱了她所有的计划。