英語口語1+1:Out of the blue

「1+1英文」
    Angela： "Why did she do that？"
    Andy： "I have no idea. It was completely out of the blue."
    「1+1中文」
    安吉拉：她為什么會那樣做呢？
    安 迪：我也不知道。突然之間就這樣了。
    「1+1解析」
    It is as if suddenly it started raining on a day when the sky was clear and blue.
    中文意思：突然，晴天霹靂。