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更新日期:2026-08-14
out of the blue (或out of a clear blue sky) informal without warning; unexpectedly 〈非正式〉出乎意外地, 突然: she phoned me out of the blue. 她突然给我打电话。 [ORIGIN: with reference to a 'blue' (i.e. clear) sky, from which nothing unusual is expected.]