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1·They might have been soldiers in civvies.

他们可能是军队中的便衣。《柯林斯英汉双解大词典》

2·She was sharp, she was demanding, she was disappointed when I said that was enough and changed back into my civvies.

她很尖刻，厉声要求着。 当我说拍够了，然后换回便衣的时候她很失望。