平白無故，字面意思就是沒有明顯的理由或者沒有充分的理由，用英語表達可以是：
①for no apparent reason:
Yesterday he worked himself up into a real frenzy and tore me off a strip for no reason at all.
昨天她發了好大一頓脾氣，還平白無故地罵了我。
②for nothing:
They quarreled for nothing.
他們平白無故地吵架。
③without any reason:
.I was criticized without any reason.
我平白無故挨了批評。
④out of the blue:
The decision came out of the blue.
這個決定太出乎意料了。
不過還有一個更妙的單詞，也可以表達"平白無故"的意思，就是just, 你有沒有想到呢：
Nobody in Wuhan just went for a walk.
在武漢，沒有人平白無故出去散步。
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